39 has factors (1 * 39) & (3 * 13)
Here we'll try
m + n = 13
m - n = 3
2m = 16
m = 8
2n = 10
n = 5
2mn = 2 * 8 * 5 = 80
So this choice is no good.
Let's go with
m + n = 39
m - n = 1
2m = 40
m = 20
2n = 38
n = 19
Thus
x = 20² - 19² = 39
y = 2 * 20 * 19 = 760
z = 20² + 19² = 761
I combined the three steps together and the following are my thoughts:
We can set the fixed fee for renting as (f) and an dynamic fee related to days as (d) per day, then we have:
Then we could get f=16, d=4, so we could have the equation as follows:
y = 16 + 4x
Answer:
answer is B 38-18
Step-by-step explanation:
38 + (-18)
38-18
Answer:
$625
Step-by-step explanation:
K(t)=10t+425
k(20)=10(20)+425
k(20)=200+425
k(20)=625
$625
Hope this helps!