3 to the negative second power is written like this:

.
When simplifying an expression with a negative exponent, you take a positive version of the exponent, in this case that would be 2, and apply that to the base.
After doing that, we have 9.
The next step is to put one over that number.
In this case, now after doing that the answer is

.
Hope this helps!
Answer:
25+38= 63
Step-by-step explanation:
Used a calculator.
Answer:
c. (x+4)(2x)•(x + 4)(3x)
Step-by-step explanation:
Answer:
1276.19553 
Step-by-step explanation:
First, find height using Pythagoras thorem.
a=
a=15.61
Then use the formula to find the surface area of a cone.
π•12.5•(12.5+
)=1276.19553 
1)He should measure the perimeter.
9+5+9+5=28 inches
2) she should measure the circumference
3) He should measure the Area
8×14=112 Square feet