1) 7(0.5+1) + 1.5 - = 7(1.5) + 1.5 - = 10.5 + 1.5 - = 12 - = 3
2) -0.9(6-5a) + 2.5a + 1= -0.9(6) - (-0.9)(5a) + 2.5a + 1= -5.4 + 4.5a + 2.5a + 1= 7a - 5.4 + 1= 7a + 6.6
1) 7(0.5+1) + 1.5 -
= 7(1.5) + 1.5 -
= 10.5 + 1.5 -
= 12 -
= 3
2) -0.9(6-5a) + 2.5a + 1
= -0.9(6) - (-0.9)(5a) + 2.5a + 1
= -5.4 + 4.5a + 2.5a + 1
= 7a - 5.4 + 1
= 7a + 6.6