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4 years ago

Simplify by combining like terms: -4x - 2y - 7x - 8y

Mathematics

1 answer:

Sav [38]4 years ago

3 0

Step-by-step explanation:

Solving like terms

-4x - 7x - 2y -8y

-11x - 10y

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Three printing presses, R, S, and T, working together at their respective constant rates, can do a certain printing job in 4 hou

zmey [24]

Answer:

20(E)

Step-by-step explanation:

Printing press R, S and T are working together at their respective constant rate.

They can do a job for 4 hours.

Let r, s and t be the time for printing press R, S and T to complete the job alone at their respective constant rate.

Rate of printing press R = 1/r

Rate of printing press S = 1/s

Rate of printing press T = 1/t

Rate = job / time

R + S + T = 4

1/r + 1/s + 1/t = 1/4

S + T = 5

1/s + 1/t = 1/5

Substitute 1/s + 1/t = 1/5 in the equation 1/r + 1/s + 1/t = 1/4

1/r + 1/5 = 1/4

1/r = 1/4 - 1/5

1/r = (5 - 4)/ 20

1/r = 1/20

r = 20 hours

It takes the printing press R 20 hours to complete the job alone

3 0

4 years ago

A company sets up a food booth at the county fair. The fee for the food booth is $100 plus $5 per day. The fee for the game boot

san4es73 [151]

Answer:

$210

Step-by-step explanation:

We will model the food booth and game booth as linear functions $f(x)=mx+b$ where $m$ is the charge per day, $b$ is the flat fee, and $x$ is the number of days.

Food booth: $F(x)=5x+100$

Game booth: $G(x)=7x+50$

We solve for both equations, letting $x=5$ :

$F(5)=25+100=125$

$G(5)=35+50=85$

We add the two values to obtain the total cost of $210.

4 0

3 years ago

Please only answer 6.

Illusion [34]

Answer:

Use keep change flip And narrow down to a simplest anwser

5 0

3 years ago

Please help me <br> Which of the following is the inverse of the function given below?

gtnhenbr [62]

The function is described by the rule $f(x)= \frac{x+2}{7}$ .

The inverse function $f^{-1}$ is such that $f(f^{-1}(x))=x$ .

Thus, since $f(x)= \frac{x+2}{7}$ , we have $f(f^{-1}(x))=\frac{f^{-1}(x)+2}{7}$ .

Equating the two ways we expressed $f(f^{-1}(x))$ , we have:

$\displaystyle{ \frac{f^{-1}(x)+2}{7}=x$ .

Rearranging, we have:

$\displaystyle{ f^{-1}(x)= 7x-2$ .

Answer: first choice: p(x)=7x-2

4 0

3 years ago

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Find the average rate of change of a function that contains the points (-2,3) and (2,5).

boyakko [2]

The slope or rate of change would be 1/2

8 0

3 years ago

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