Answer:
1/6^3
Step-by-step explanation:
The applicable rules of exponents are ...
a^-b = 1/a^b
(a^b)(a^c) = a^(b+c)
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Your expression can be simplified as follows:

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<em>Additional comment</em>
If you think of an exponent as signifying repeated multiplication, the rules of exponents may be easier to remember. The exponent tells you how many times the base is a factor in the product.
Consider multiplication:

Consider division:

This may help you see that a positive exponent in the denominator is equivalent to a negative exponent in the numerator (and vice versa).
Answer:
x=20
Step-by-step explanation:
5(x+9) =145 (watch carefully)
5x + 45 = 145
5x + 45 - 45 = 145 - 45
5x = 100
5x/5 (to cancel eachother out) then --> 100/5
x=20
Answer:
A
Step-by-step explanation:
That's the formula for the solution of a quadratic equation, like this:

The formula is:

In your case:

The only answer that has c = -2 is the first one, A.
If you move the 5 to the left-hand side, it becomes -5 and with the +3 gives a -2.
(8) =b
explaintion is : 3 seven times is 21