Mathematics High School

In a test, 5 marks are given for every correct answer and (-2) marks are given for every incorrect answer. 1) Anjali scored 30 mark. If she got 10 correct answers, how many questions she answered incorrectly? 2) Rohan got 4 correct answers. If he scored (-12) marks in the test, how many questions he answered incorrectly?

Answers

Answer 1

Answer:

1. Anjali answered 10 questions incorrectly

2. Rohan answered 16 questions incorrectly

Step-by-step explanation:

1 .The mark given for one correct answer = 5

That means that the mark given for 10 correct answers = 5 × 10 = 50

But Anjali's score = 30

Also, the marks gotten for incorrect answers = 30 - 50 = -20

Mark given for one incorrect answer = -2.

Therefore, number of incorrect answers would be;

= (-20) ÷ (-2)

= 10

•Anjali answered 10 questions incorrectly.

2. Total marks = -12

Number of correct answers = 4

Total marks for correct answers = 4 × 5 = 20

Also, marks for incorrect answers = -2 × Number of incorrect answers

Therefore,

Total marks = Marks for the correct answers + Marks for the incorrect answer

-12 = 20 + (-2) × Number of incorrect answers

-12 - 20 = -2 × Number of incorrect answers

-32 / 2 = Number of incorrect answers

Number of incorrect answers = 16

• Rohan answered 16 questions incorrectly.

Related Questions

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what is a constant of proportionality?

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The constant of proportionality is the constant value of the ratio of two proportional quantities x and y, typical is Y=KX

Answer:

y=k/x

Step-by-step explanation:

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7 + 2 (4x - 3) = ?

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Calculate 2 times 4x is 8x and 2 times -3 is -6 it should be 7+8x-6 from there you move the six to the seven and it should be 1+8x
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Triangle ABC is dilated by a scale factor of 4 to from triangle A’B’C.
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The coordinate of vertex C are (2,6) (-4,12) (12,-4)

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Answer Triangle ABC is dilated by a scale factor of 4 to from triangle A’B’C. The coordinate of vertex A’ are

Step-by-step explanation:

solve for X -6+9x 7x+12


Parallel and Perpendicular lines​

Answers

Answer:

[tex]=63x^2+6[/tex]

Step-by-step explanation:

[tex]-6+9x\cdot \:7x+12[/tex]

[tex]9x\cdot7x=63x^2[/tex]

[tex]=-6+63x^2+12[/tex]

[tex]=63x^2-6+12[/tex]

[tex]=63x^2+6[/tex]

An elevator started on the first floor, went up 18 floors, then came down 11 floors and went back up 16.
1 + 18 - 11 + 16
1 - 18 - 11 + 16
1 + 18 + 11 - 16
1 - 18 + 11 - 16

Answers

Answer:

1+18-11+16

Step-by-step explanation:

if the elevator went up it will be plus but if the elevator came down it will be minus and then you will get 1+18 because it went up and then it go down 11 floor and it will be 1+18-11 and then it went up again 16 floor so the last answer will be 1+18-11+16

Last week, Shiloh owed her brother $25.50. This week, she owes him another $6.30, for a total of $31.80.

The story above can be modeled by the addition problem -25.50 + (-6.30) = -31.80. Write a related story that is modeled by the division problem -31.80 ÷ 6 = -5.30.

Answers

Answer:

Sarah had $31.80 and she owed 6 friends money.So she owes each friend $5.30.

Hope i helped please mark brainliest

Do 4x and 15 + x have the same value when x is 5? Explain your reasoning

Answers

Answer:

Yes, they do have the same value

Step-by-step explanation:

4(5)=20

15+5= 20

Answer: Yes

Step-by-step explanation: 15+5 is 20, and 4(5) is also 20, so 20=20

Someone tell me this i'm not smart

Answers

1.)-7
2.)1
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i need help please. i will give you a brainly

Answers

Answer:

2 for the second box and 162for the third box

Step-by-step explanation:

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Expand.
Your answer must be a polynomial in standard form.
m(-m^3 + m^2 + 3m)

Answers

Answer:

-m^4+m^3+3m^2

Step-by-step explanation:

what is the domain and range of this function

Answers

T j itfjudvktvjyfbjgf XY

Answer:

what function

we cant see a problem

Step-by-step explanation:

Help! Pls! I'm lost. I would really appreciate it if anyone knows all the answers.

(Math; Scientific Notations)

Answers

Answer:

1) b. 1.562x10⁸

2) a. 4.8x10⁶

4) d. 2.3x10³

5) a. 4.21x10 -⁶

6) 6.6835x10⁵

Step-by-step explanation:

1) (2.2x10⁴)•(7.1x10³)= 156200000

2) 9.6x10⁹÷2x10³= 4800000

4) 6.9x10⁸= 2300

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6) 6.72x10⁵ - 3.65x10³= 668350

Which expression is equivalent to StartFraction 1 Over 1 minus 2 sine squared (x) EndFraction?

StartFraction 1 Over cosine (2 x) EndFraction
StartFraction 1 Over sine (2 x) EndFraction
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Sine (2 x)

Answers

Answer:

A. 1/cos(2x)

Step-by-step explanation:

Answer:

A

Step-by-step explanation:

on edge

843 ÷ 10 To solve 843 ÷ 10, start by showing 843 on the place value chart. thousands hundreds tens ones tenths hundredths thousandths 1 2 3 4 5 6 7 8 9 0

Answers

Answer:

84.3

Step-by-step explanation:

843 ÷ 10

The place value of 843 is

8 = Hundreds

4 = Tens

3 = Units or ones

Hence,

843 ÷ 10

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= 84.3

A jar of pinto beans and black beans has a ratio of 1:1. There are 300 pinot beans. How many beans in total are in the jar?

Answers

300

1:1

1*300:1*300

300:300

Whenever the two numbers in a ratio are the same it means that they're equal. Hope this helps :)

You decided to get the Cinemark Movie Pass. It is a flat
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Answers

i think it’s y= 11x + 8 :) sorry it it’s wrong !!

Answer:

y = 11t + 8

Step-by-step explanation:

Since the starting fee is 8 dollars and the additional costs are 11 dollars per ticket, you can write the equation as:

y = 11t + 8

Where "t" represents the amount of tickets bought.

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Answers

Answer:

B. y=1/3x+4

Step-by-step explanation:

The graph shows a line with a slope of -3. Perpendicular slopes is the reciprocal with a different sign (positive or negative). The perpendicular of -3 is 1/3, and B. is the only option with this slope.

Answer:

B. y=1/3x+4

Step-by-step explanation:

Find the height of a right rectangular prism with surface area 286 m 2 , length 10 m, and width 8 m.

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Answers

the answer is 17

286 m 2/10x8

HELP PLEASE THIS IS DUE
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Answers

Answer:

A

Step-by-step explanation:

y=−2x+2

The correct graph is option A.

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What strategies can you use to solve a linear equation such as 136x+6) = X+8? Your answer:​

Answers

Answer:

Simplify each side of the equation as much as possible. ...

Collect all the variable terms on one side of the equation. ...

Collect all the constant terms on the other side of the equation. ...

Make the coefficient of the variable term to equal to 1. ...

Check the solution.

Step-by-step explanation:

Write 2,743,000 in scientific notation.

Answers

Answer:

2.743 x 10 6

Step-by-step explanation:

Answer:

2.743 x 10^6

Step-by-step explanation:

just answer number 2

Answers

Answer:

C

Step-by-step explanation:

just is lol please make me brainliest

Katherine is checking the prices of two different catering companies for her wedding reception. Brenda's Bridal Catering charges $300 for a cake plus $18 per person. Sarah's Complete Catering charges $450 for a cake plus $15 per person. Katherine really likes the cake from Sarah's Complete Catering, so she wants to use that company for her reception. Which inequality can be used to find x, the maximum number of people she can invite to the reception so that the total charge from Sarah's Complete Catering is less than the total charge at Brenda's Bridal Catering?

Answers

Answer:

Maximum of 50 persons

Step-by-step explanation:

Straight line equation

let the total prices be y

and the number of persons be x

1.  Brenda's Bridal Catering charges

the expression for the charges is

y=mx+c

y=18x+300---------------1

2.  Sarah's Complete Catering charges

the expression for the charges is

y=mx+c

y=15x+450---------------2

equating 1 and 2 we can then solve for the number of guest as

18x+300=15x+450

18x-15x=450-300

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divide both sides by 3

x=150/3

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Therefore she can invite a maximum of 50 persons

How can i explain it and whats the answer?

Answers

Answer:

a) (5,3)

Step-by-step explanation:

For the X coordinate, 1+4=5

For the y coordinate 8-5=3

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Answers

Answer:

3 [tex]\frac{8}{9}[/tex]

Step-by-step explanation:

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42, 78, 42, 53, 60

Answers

Answer:

53

Step-by-step explanation:

first put it in least to greatest

42,42,53,60,78

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Which of these situations can be represented by the opposite of -25?

A scuba diver is 25 feet below sea level.

Leon gets paid $25


An airplane descends 25 feet.

Sala has a $25 debt

Answers

A scuba diver is 25 feet below sea level

Answer:

the following 3 are correct statements

A scuba diver is 25 feet below sea level.

An airplane descends 25 feet.

Sala has a $25 debt

A kayak is originally priced at $160. The online retailer gives a discount and the kayak is now priced at $88. Enter the percentage discount for the cost of the kayak.

Answers

Answer:An important category of percentage exercises is markup and markdown problems. For these, you calculate the markup or markdown in absolute terms (you find by how much the quantity changed), and then you calculate the percent change relative to the original value. So they're really just another form of "increase - decrease" exercises.

Step-by-step explanation:

Answer:

45%

Step-by-step explanation:

O= 160

C=88

160-88=72

72       ?

160    100

72 times 100=7200

7200/160=45

Solve the system by substitution. Check your solution.
y = 0.8 x + 7.2.
20 x + 32 y = 48.
a. (8, -6)
b. (5, 11)
c. (-4, 4)
d. (-10, 2)

Answers

Answer:

c.  (-4, 4)

Step-by-step explanation:

y = 0.8x + 7.2

20x + 32y = 48

20x + 32y = 48

20x + 32(0.8x + 7.2) = 48

20x + 25.6x + 230.4 = 48

45.6x + 230.4 = 48

45.6x = -182.4

x = -4

y = 0.8x + 7.2

y = 0.8(-4) + 7.2

y = -3.2 + 7.2

y = 4

Answer:

C. (-4,4)

Step-by-step explanation:

Because i did it and got it right on (Edge)

Slopes of perpendicular lines are _____.

a. negative reciprocals
b. the same
c. reciprocals
d. opposites

Answers

Answer:

Correct: Option a. negative reciprocals

Step-by-step explanation:

Perpendicular lines are defined as those who intersect at an angle of 90°.

There is an easy way to find out if two equations of lines correspond to perpendicular lines or not.

If line 1 is

y=m1x+b1

And line 2 is:

y=m2x+b2

The condition for the lines to be perpendicular is that:

m1*m2=-1

Solving for m2:

[tex]\displaystyle m2 = -\frac{1}{m1}[/tex]

As seen, both slopes are negative reciprocals.

Correct: Option a. negative reciprocals

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