Answer:
x² - 10x + 21
Step-by-step explanation:
the 3rd one
(x-3)(x-7)=0
The number may be 6 because 6 • 3 = 18, and 2 more than 18 would be 20
8hrs = 480mins
6hrs = 360 mins
472/480 = 0.983...
0.983... x 360 = 354
D) 354
Actually, she worked for seven hours, so I'll solve for that.
7.20 x 3 = 21.6
6.75 x 4 = 27
21.6 + 27 = 48.6
48.6 /2 = 24.3
Her average should be $24.3 If she did work six hours, just multiply 6.75 x 3 and do what I did.