The sum means addition.
Add the like terms together.
4x^3+2x^2-4x+3
+ 7x^3-4x^2+7x+8
4x^3 + 7x^3 = 11x^3
2x^2 + -4x^2 = -2x^2
-4x +7x = 3x
3 +8 = 11
The answer is : 11x^3 - 2x^2 + 3x + 11
1/4 of a five gallon bucket is 1 1/4 gallons.
5-1 1/4=3 3/4 gallons left to fill.
Answer: 3 3/4 gallons
The answer is 10x - 1380m + z
It means <span>Bomb Threat Assignment...</span>
3 in the power of ten means "10^3."

How to solve exponents is to multiply the number as many times as it's exponent. So in this case you will have to multiply ten, three times.

Which would mean that....

The answer is 10^3.
Hope this helps.