Rewrite the function f(x)=7 (1/2)^3x using the properties of exponents.

f(x) = (7 x)\/8

Step-by-step explanation:

idk, i just used wolframalpha mate...

B

Step-by-step explanation:

f(x)= 7 (1/8)^x

or

step-by-step explanation:

we need to solve for 'x' the following equation:  

we have that:

⇒

⇒ ⇒

factorizing, we get that:

  ⇒

then, the solutions are: or

nothing extraneous has been found!

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.