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

Which statement is true 1.the pythagorean theorem can be used to find the missing side of any triangle 2.the pythagorean theorem can be used to find the missing side of any polygon 3. the pythagorean theorem can be used to find the missing side of any right triangle 4.the pythagorean theorem can be used to find the missing side of any isosceles triangle

Why is studying fractions important

Find the missing factor. write your answer inexponential form.9^2=9^4×