3 years ago

What is the percent change of a baseball that originally cost $2.50 goes on sale for $2.00

Mathematics

1 answer:

nikitadnepr [17]3 years ago

6 0

Answer:

The answer is a 20% discount.

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Find the distance (-1,-2) and (3,-1)

jasenka [17]

Answer:

$\sqrt{17}$

Step-by-step explanation:

$\sqrt{4^2 + 1^2}$

$\sqrt{17}$

5 0

2 years ago

Francis teaches the piano. He charges each student an enrollment fee of $100 plus $15 per hour of piano lessons. The average cos

Kryger [21]

Answer:

y=15x+100

Step-by-step explanation:

increases by 15, 100 is starting free

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3 years ago

"There are 15 questions on an exam. In how many ways can the exam be answered with exactly 8 answers correct?"

erastovalidia [21]

Answer:

The exam can be answered with exactly 8 answers correct in 6435 ways.

Step-by-step explanation:

The order is not important.

For example, answering correctly the questions 1,2,3,4,5,6,7,8 is the same outcome as answering 2,1,3,4,5,6,7,8. So we use the combinations formula to solve this problem.

Combinations formula:

$C_{n,x}$ is the number of different combinations of x objects from a set of n elements, given by the following formula.

$C_{n,x} = \frac{n!}{x!(n-x)!}$

"There are 15 questions on an exam. In how many ways can the exam be answered with exactly 8 answers correct?"

Combinations of 8 questions from a set of 15. So

$C_{15,8} = \frac{15!}{8!(15-8)!} = 6435$

The exam can be answered with exactly 8 answers correct in 6435 ways.

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3 years ago

Which equation is true given w=7

DENIUS [597]

Where is the equation?

6 0

3 years ago

Find the solution of the system of equations.

AnnyKZ [126]

Answer:

x=-2 and y=-3

Step-by-step explanation:

2x+4y=-16

-2(-2x+2y=-2)

2x+4y=-16

4x-4y=4

6x=-12

x=-2

2x+4y=-16

2(-2)+4y=-16

-4+4y=-16

+4 +4

4y=-12

y=-3

6 0

3 years ago

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