7

In a class test (+ 5) marks are given for every correct answer and (-3) marks are given for every incorrect answer.

OLEGan [10]

Answer:

a. 4 marks b. 9 questions

Step-by-step explanation:

a) Anu gets 8 correct answer and 12 incorrect answers what is her score?

Since Anu got 8 correct answer and 12 incorrect answers, and + 5 marks is given for every correct answer and (-3) marks are given for every incorrect answer, the total score for correct answers is number of correct answer × marks for correct answer = 8 × (+ 5) = 40.

Also, the total score for incorrect answers is number of incorrect answer × marks for incorrect answer = 12 × (- 3) = -36.

Anu's total score = total score for correct answers + total score for incorrect answers = 40 + (-36) = 40 - 36 = 4 marks.

So, Anu scored 4 marks.

b) Sam answered all the questions and scored 28 marks though he got 11 correct answers. How many incorrect answers had he attempted?

Let x be the number of incorrect answers. Since the marks for incorrect answers is -3, then his total score for incorrect answers is -3x.

Since Sam got 11 correct answers and is given + 5 marks for each correct answer, then his total score for correct answers is 11 × (+5) = +55.

Since he gets a total of 28 marks, we have that total score for incorrect answer + total score for correct answer = 28.

So, -3x + 55 = 28

Solving for x, we have

-3x = 28 - 55

-3x = -27

x = -27/-3

x = 9

Since x = 9, Sam attempted 9 incorrect questions.

.

6 0

3 years ago

Read 2 more answers

The table below represents an exponential function, g, that has been vertically shifted from the parent function, f(x)= 2^x. Det

astra-53 [7]

Answer:

1. The size of shift from function f to function g is -12

2. The plot of the points of a function that is shifted only half as much as g from the parent function f is in the attached file in blue color.

Step-by-step explanation:

Parent function: f(x)=2^x

x=0→f(0)=2^0→f(0)=1

x=1→f(1)=2^1→f(1)=2

x=2→f(2)=2^2→f(2)=4

x=3→f(3)=2^3→f(3)=8

x=4→f(4)=2^4→f(4)=16

Size of the shift from function f to function g: s

s=g(0)-f(0)=-11-1→s=-12

s=g(1)-f(1)=-10-2→s=-12

s=g(2)-f(2)=-8-4→s=-12

s=g(3)-f(3)=-4-8→s=-12

s=g(4)-f(4)=4-16→s=-12

Points of a function h that is shifted only half as much as g from the parent function, f. Use the same x- values as used in the table for function:

s2=s/2→s2=(-12)/2→s2=-6

x h(x)

0 1+(-6)=1-6=-5

1 2+(-6)=2-6=-4

2 4+(-6)=4-6=-2

3 8+(-6)=8-6=2

4 16+(-6)=16-6=10

7 0

3 years ago

The Heller family is having a cookout. To be sure that they have enough food, they plan to have 0.5 pound of hamburger for each

Anastaziya [24]

15 times .25 or 1/4
(1lbs=4 kids, 15 divided by 4= 3.75)
6.25 divided by .5 is over 12
so 12 adults

3 0

4 years ago

Read 2 more answers

Which of the following fractions is equivalent to 4/20? 2/6 8/16 1/2 3/6 5/10 7/11

scZoUnD [109]

Answer:

1/2

Step-by-step explanation:

8 0

3 years ago

HELP ASAP!!!!Write a function g whose graph represents the indicated transformation of the graph of f.

Pavel [41]

Answer:that hard

Step-by-step explanation:

3 0

3 years ago