13 x 13
or
13^2 (13²) will give you 169
and when two negative numbers are put together you get a positive so in this case -13 would work too.
Answer:
Df=[-7,∞)
Step-by-step explanation:
The square root of 7 is roughly 2.6
The square root of 8 is roughly 2.8
Hence Euler's number is between

and

.
Answer:
Option A is correct.
The constant of variation is, 
Step-by-step explanation:
The Direct variation says that:
if a vary directly to b then, the equation is of the form: a = kb where k is the constant of variation.
Given: if y varies directly as x.
By definition of direct Variation:
y = kx where is the constant of variation.
It is also given that: y = -3 and x =2
Solve for k;
-3 = 2k
Divide both sides by 2 we have;

Therefore, the constant of variation is, 
Answer:
J
A=7.07cm^2
Step-by-step explanation:
A= (pi)(r^2)
diameter=3
radius= 1/2 of the diameter = 1.5
pi = approximately 3.14
A= (3.14) (1.5)^2
A= 7.065 ----> rounds to 7.07