Which expression is equivalent to 13 - (-21) ? Choose 1

(Choice A) 
13 + 21

(Choice B) 
-21 - 13

(Choice C)
-13+21

(Choice D)
-21+13

Choice A

Step-by-step explanation:

Negative times negative equals positive, is -21 would change to positive 21

Hope this helps!

abde or 1,2,4, 5 is the answer

step-by-step explanation:

the answer is:

the correct option:

b.

to solve the problem, we need to remember how to operate to simplify exponential expressions using the logarithms.

we are given the equation:

then, using placing logarith with base 7 on both sides of the equation, we have:

so, rounding the obtained result to two decimal places (nearest hundreth), we have:

hence, we have that the correct option:

b.

have a nice day!