The answer is 25. Simply use Pemdas to figure out what order to do the problem in. To check your work, a calculator is always a good option.
One divided by negative one is written as 1/-1. This is the same thing as -1/1. The reason to write it the second way is because anything divided by 1 is itself. So the answer is -1.
It is 1 over r squared, or r to the negative second power.
It is negative one divided by 4 multiplied by x to the power of 1.5 -1/(4(x^1.5))
0.8 divided by 10 to the second power = 0.08
1/36
Add the second negative to the first negative, so -1 - -2 = 1
-19/9. When you have a fraction divided by a fraction, you multiply the first fraction by the second fraction flipped over (switch the numerator and denominator). The sevens cancel out, and you are left with -19/9.
A second is divided into milliseconds and there are 1000 milliseconds in a second.
12 divided by 3 to the second power with work = 4
Anything divided by one is not changed.
486
depends if the first number is bigger than the second number than it is a negative