Answer:

A. 1. 5a + 3b

= 5(4) + 3(3)

= 20 + 9

= 29

2. a/9 + b/6

= 4/9 + 3/6

= 4/9 (4) + 3/6 (6)

= 16+18/36

= 34/36

= 17/18

3. 7a + 8b

= 7(4) + 8(3)

= 28 + 24

= 52

4. 4(2a + 3b)

= 4(2(4) + 3(3))

= 4(8 + 9)

= 4(17)

= 68

5. a² + 3b²

= 4² + 3(3)²

= 16 + 3(9)

= 16 + 27

= 43

B.

1. x - 36 = 61

x = 61 + 36

x = 97