Simplify the expression.
-20a-2b-7
5a-5b3

Step-by-step explanation:

Step 1: Write out the expression separately. Like so:

-20                              5  

Step 2: Since the it's a fraction were dividing. The bases of the exponents are the same, so you can divide the numbers and subtract the exponents.

-20  ÷  5 = -4    

 -   =

-      =

Step 3: Notice that there is a negative exponent. To get rid of the negative, you have to make it positive and move it from being the numerator to being the denominator.

→→→

Step 4: Rewrite the expression with the -4, , and .

hope this helps  :)

13

step-by-step explanation:

169-1=168

168-3=165

165-5=160

160-7=153

153-9=144

144-11=133

133-13=120

120-15=105

105-17=88

88-19=69

69-21=48

48-23=25

25-25=0

since it took 13times to completely subtract it hence its square root is 13