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Alenkasestr [34]
3 years ago
14

An electrician uses the function f(x) = 60 + 40x to calculate the total cost, in dollars, for a service call that takes x hours

to
complete. What does the coefficient 40 represent?
A)
The electrician works 40 hours.
B)
The electrician charges $40 per hour.
Eliminate
The electrician drives 40 miles to work.
D)
The electrician charges a $40 trip charge.
Mathematics
1 answer:
zloy xaker [14]3 years ago
3 0

Answer:

(B) The electrician charges $40 per hour.

Step-by-step explanation:

Total cost=fixed cost + variable cost

F(x)=60+40x

Fixed cost =60

Variable cost=40x

x=hours of service

40=40 dollar per hour charge

The coefficient 40 represent the electrician charge of $40 per hour

(B) The electrician charges $40 per hour.

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The value of y is directly proportional to the value of x. If y = 35 when x = 140, what is the value of y when x = 70?
Andre45 [30]

Answer:

17.5

Step-by-step explanation:

y=kx

35=140k

k= 35/140

k= 1/4

y=1/4X

when X=70

y= 1/4*70

y= 17.5

4 0
2 years ago
You asked your classmates to name their favorite type of music. You found that 12 students like rock, 8 like rap, 6 like R&B
ale4655 [162]

From this, we can see that the total amount of students being asked = 12 + 8 + 6 + 4 = 30.

12 of 30 like rock, in percentages that is 12/30 = 40$

Full circle has 360 degrees.

40% * 360 degrees = 144 degrees

144 degrees should represent rock music on a pie chart.

Hope this helps!

8 0
3 years ago
If A/B and C/D are rational expressions, then which of the following is true?
Afina-wow [57]

Answer:

Option D. \frac{A}{B}*\frac{C}{D}=\frac{A*C}{B*D}

Step-by-step explanation:

we have

\frac{A}{B} and \frac{C}{D}

we know that

To <u>multiply fractions</u> multiply the numerators of the fractions to get the new numerator and multiply the denominators of the fractions to get the new denominator

To <u>divide two fractions</u>, multiply the first fraction by the reciprocal of the second fraction

\frac{\frac{A}{B}}{\frac{C}{D}}=\frac{A}{B}*\frac{D}{C}

and

\frac{A}{B}*\frac{C}{D}=\frac{A*C}{B*D}

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Answer:

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Answer:

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