1. What is the value of 7 + 2a when a = 6?
2. What is the value of 2x + 3 when x = 60?
3. What is the value of 35 + 4y when y = −5?
4. What is the value of 10 + 3a + b when a = 4 and b = −7?
5. What is the value of 2a + 3b + c when a = 2, b= 5 and c = −4?
6. What is the value of 4 + xy + z when x= −3, y = −7 and z = 6?
7. What is the value of 9 + 2xyz when x = −6, y = −12, z = −3?
8. What is the value of 2a + 3bc − 4c when a = −6, b = 7 and c = 8?
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