Answer:
1. a+12; a=5
Solution:
a + 12= 5 + 12= 17
2. a-b; a=7 and b=4
Solution:
a-b= 7-4= 3
3. 9a-3; a=2
Solution:
9a-3= 9(2)-3= 15
4. 4x-2y+z; x=1, y=2, z=3
Solution:
4x-2y+z= 4(1)-2(2)+3= 3
5. 2x^2+4z; x=1 and z=2
Solution:
2x^2+4z= 2(1)^2+4(2)= 10
Tip: Just substitute the given constants to the algebraic expressions.
