Answer:
6
Step-by-step explanation:
Given expression:
a varies directly as b;
a ∝ b
So;
a = kb where k is the constant of proportionality;
if a= 7 and b = 2;
7 = 2k
k =
Now, find b when a = 21
21 =
x b
b = 6
Answer:
12
Step-by-step explanation:
The formula of a slope:

We have the points (5, 2) and (0, -13). Substitute:

<h3>Answer: slope = 3</h3>
Answer:
16
Step-by-step explanation:
a/(1-r)
Use the infinite geometric series formula.
Answer:
Step-by-step explanation: