12 x^{5} y^{7} and 7 x^{2} y^{9}

19x^7y^16

Step-by-step explanation:

And usually means to add, so combine your like terms:

12x^5y^7 + 7x^2y^9

12 + 7 = 19

x^5 + x^2 = x^7

y^7 + y^9 = y^16

Step-by-step explanation:

(12x⁵ y⁷) * (7x²y⁹) = (12*7) * (x⁽⁵⁺²⁾ ) (y⁽⁷⁺⁹⁾)

                            = 84x⁷y¹⁶

In exponents multiplication, if base are same, then add the powers.

xᵃ * xᵇ = x⁽ᵃ⁺ᵇ⁾

step-by-step explanation:

use pothagarean therom

a^2+b^2=c^2 so first ac

acm is a right triangle because c= 90°

and am (the hypotenuse or c) =16+9 =25

but there is not enough info we need another angle or side length