Simplify this expression. 3x2(7x2 − 9)
a) 21x2 − 9
b) 21x2 − 27x2
c) 21x4 − 9
d) 21x4 − 27x2

Factor the expression using gcf 9b+45

80 points suppose marcy made 45 posts online. if 23 of them contained an image, what percent of her posts had images? round your answer to the nearest whole percent. 54 percent 51 percent 49 percent 48 percent

Ihave a triangle with a 60 degree angle. lets use d for that angle. what are the values of e and f if d is 60 degrees? and what do you notice about the values of e and f?