F(x)=(a*x) - (b*4), f(0)=16, and f(3)=25. what is a+b?

This is a quite interesting problem.

Since it is normally unsolvable without the functions, the answer must lay somewhere in the examples given.

In this case, it lays in f(0).

Why would that be? Because anything times 0 is equal to 0.

In f(0), x is equal to 0, so a*x is therefore equal to 0.

Knowing that, the only thing that is left behind is, when you substitute in 0 for x:

16 = -(b*4)

Therefore, we can then solve to get:

-16 = b * 4

-4 = b

And now it's fairly simple to get a: just plug b into f(3) and solve.

25 = (3a) - (-4*4)

25 = 3a + 16

25 - 16 = 3a

9 = 3a

a = 3

And now to solve for what the question is looking for, just add a and b.

3 + -4 = -1

And there's your answer.

exa:

)

3+11

14

step-by-step explanation:

from this example, we can see that subtracting with integers is the same as adding the opposite. we can solve using a number line or by using the saying "keep, change, change" to us solve. it is important to remember that we can subtract a negative and end up with a larger number than we started with.

answer: 7 x 2/5 = 2.8 hours, is your answer. your welcome! : 3

step-by-step explanation: first work out how long it took to hose 1/7 of the lawn which is 2/5 hours. times that by 7 to get the whole lawn.

sorry i don't know the other answer. i didn't learn what a proportional relationship is.