Question

35 points pleaseeeehelp me out hereeee

Answer 1

1.) (9*2)-(9*-1)
2.)4*(9+1)
3.)A:GCF=5
B:5*(20-15)
4.) 7x+14

Answer 2

Explanation:

18) 9*(2-1) = (9 * 2) - (9*1)

19) (4*9) + (4*1) = 4*( 9+ 1)

20) a) 20 = 2 * 2 * 5

15 = 3 * 5

GCF = 5

20 - 15 = (5*4) - (5*3)

= 5*(4 - 3)

21) 7*(x+ 2) = (7*x) + (7*2)

= 7x + 14