Use the distributive property to expand the expression. 5x2 − (6x − 4y) + 9z

5x² − 6x + 4y + 9 z

Step-by-step explanation:

5x^2 −1(6x − 4y) + 9z

You see the -1 in front of (6x-4y) that is actually there, it is just disguised as a - sign. When you take away the ()'s you must distribute this negative one to 6x and -4y.

-1 * 6x = -6x

-1 * -4y = 4y

so now we have 5x² - 6x + 4y + 9z*

*the + in front of 9z need not  be changed we are only changing the stuff inside the ()'s

answer: options?

step-by-step explanation:

b is 38 degrees.

a is 52 degrees.

this is because if b is 38 and a is 14 degrees more than b than 38+14=52 and 52+38=90 degrees. hope this .