Question

Need Help Number 10 Please

Answer 1

Third and fourth choice

Explanation:

The problem declares two variables: y is total cost and x is hours. You can observe the choices -- substitute in hour's value and compare if it's true.

A

Since the first choice says that the total cost is $1.50 for 1 hour, substitute x = 1 in:

`\displaystyle{y=2.10(1)+1.50}\\\\\displaystyle{y=2.10+1.50}\\\\\displaystyle{y=3.60}`

Therefore, parking for 1 hour is $3.60, not $1.50. Hence, the first choice is false.

B

The second says that the total cost is $4.20 for 2 hours, do the same thing; substitute in x = 2:

`\displaystyle{y=2.10(2)+1.50}\\\\\displaystyle{y=4.20+1.50}\\\\\displaystyle{y=5.70}`

Therefore, for 2 hours, it's $5.70. Hence, the second choice is false.

C

The third says that it's $7.80 for 3 hours. Substitute in:

`\displaystyle{y=2.10(3)+1.50}\\\\\displaystyle{y=6.30+1.50}\\\\\displaystyle{y=7.80}`

$7.80 after evaluation as said. Hence the third choice is correct.

D

The fourth says that it's $12.00 for 5 hours:

`\displaystyle{y=2.10(5)+1.50}\\\\\displaystyle{y=10.50+1.50}\\\\\displaystyle{y=12.00}`

$12.00 after evaluation as said. Hence the fourth choice is also correct.

Therefore, correct answers are third and fourth choice.