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
If Caitlin is...
A. 3 years old, the difference between her and Caitlin would be 9 years. That times 3 is 27. Not Amanda's age.
B. 12 - 5 = 7 (difference) 7 * 3 = 21 is not Amanda's age.
C. 12 - 7 = 5 5 * 3 = 15 = Amanda's age!
Correct answer is C
Answer:
Step-by-step explanation:
the answer is 365,412
Area of frame=area of total-area of inside ting
area=lenght times width
so
inner one
length is 16-2-2 (both sides) or 12
width or height is 9-2-2=5
so area is 12 times 5=60
outter one
16 by 9
16 times 9=144
so
outer-inner=144-60=84
so 2nd option
