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ANTONII [103]
3 years ago
8

A multiple-choice test consist of 100 questions. A correct answer is worth two marks, while an incorrect answer is worth -1 mark

s, if a student receives a score of 80, how many questions of the student answer incorrectly
Mathematics
1 answer:
user100 [1]3 years ago
3 0

Answer:

40

Step-by-step explanation:

if each question correct is worth two points, then the total points is 200. multiply the actual score by two to make the wrong answers equal the right answers, and then subtract it from 200. it should come out to look like 80*2=160\\200-160=40

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Here is a 5 by 8 grid
Ksivusya [100]

On solving the linear equation, There are in total 24 unshaded squares and 16 shaded squares.

<h3>What is a linear equation?</h3>

Ax+By=C is the usual form for two-variable linear equations. A typical form linear equation is, for instance, 2x+3y=5. When an equation is provided in this format, finding both intercepts is rather simple (x and y).

squares, where x= number of squares

2x = shaded squares

Number of unshaded squares = 3x.

This is due to the fact that there are 3 times as many unshaded squares as there are shaded squares (2 times more unshaded = 3*). (shaded)

Overall, there are 40 squares (5 * 8), therefore 40 total squares—shaded and unshaded—are present.

2x+3x = 40

5x = 40

x = 40/5

x = 8

There are 3×8 = 24 unshaded squares

8×2 = 16 shaded squares in all.

Therefore, you may shade in 8 squares whatever you choose.

To learn more about linear equation from given link

brainly.com/question/2030026

#SPJ9

5 0
1 year ago
Simplify the given expression, using only positive exponents. Then complete the statements that follow. [ (x2y3)−1 (x−2y2z)2 ] 2
Firlakuza [10]

Answer: y²z⁴ / x¹²

  • The exponent of x is 12

  • The exponent of y is 2

  • The exponent of z is 4

Explanation:

1) Given expression to simplify:

((x^2y^3)^{-1}(x^{-2}y^2z)^2)^2

2) Property: power of power:

(x^{-4}y^{-6})(x^{-8}y^8z^4)

3) Property: product of powers with the same base

x^{(-2-8)}y^{(-6+8)}z^4

4) Add the exponents

x^{-12}y^2z^4

5) Pass the negative power to the denominator:

\frac{y^2z^4}{x^{12}}

The exponent on x is  12. The exponent on y is 2. The exponent on z is 4.

4 0
4 years ago
Read 2 more answers
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Harlamova29_29 [7]

Answer:

25% decrease

Step-by-step explanation:

=(60−80)|80|×100

=−2080×100

=−0.25×100

=−25%change

=25%decrease

7 0
3 years ago
Read 2 more answers
Find the domain of f(x)= square root of x + 5
Semenov [28]

Answer:

\sqrt{x + 5}

it's 1 since X has an invisible 1 infront of it...plus domain means X and Range means Y

3 0
3 years ago
How do you simplify -(5x+1)
Roman55 [17]
-1(5x+1)
-5x-1
the (-) in front is just a short way to put (-1)
6 0
4 years ago
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