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2 years ago

8

A mechanic charges $35 to perform an inspection on a car, and $55 per hour for a repair. Which equation gives the total cost, ,

for a repair that lasts
hours?

1 answer:

pychu [463]2 years ago

3 0

Answer:

Total cost = charge fee + 55× no. of hours

Let h represents number of hours

Total cost = 35 + (55×h)

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Find the measures of an interior angle and an exterior angle of a regular 16-gon

Anastasy [175]

Answer:

2520°

Step-by-step explanation:

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shape. sides. triangles. sum int angles.

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Step-by-step explanation:

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2 years ago

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Step-by-step explanation:

Rewrite it in the form $a^2+2ab+b^2$ , where $a=x^2 and b=9.$

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2 years ago

The maximum value of the function: f(x)= -5 x ^2 +30x-200 is?

VARVARA [1.3K]

Answer:

$\displaystyle - 155$

Step-by-step explanation:

we are given a quadratic function

$\displaystyle f(x) = - 5 {x}^{2} + 30x - 200$

we want to figure out the minimum value of the function

to do so we need to figure out the minimum value of x in the case we can consider the following formula:

$\displaystyle x _{ \rm min} = \frac{ - b}{2a}$

the given function is in the standard form i.e

$\displaystyle f(x) = a {x}^{2} + bx + c$

so we acquire:

b=30
a=-5

thus substitute:

$\displaystyle x _{ \rm min} = \frac{ - 30}{2. - 5}$

simplify multiplication:

$\displaystyle x _{ \rm min} = \frac{ - 30}{ - 10}$

simply division:

$\displaystyle x _{ \rm min} = 3$

plug in the value of minimum x to the given function:

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$\displaystyle f (3)= - 5 {(9)}^{} + 30.3 - 200$

simplify multiplication:

$\displaystyle f (3)= - 45 + 90- 200$

simplify:

$\displaystyle f (3)= - 155$

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the minimum value of the function is -155

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2 years ago

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lorasvet [3.4K]

Answer:

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Step-by-step explanation:

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