a. 13a+2a-5a
Combine like terms:
13a + 2a - 5a = 15a - 5a
Simplify further:
15a - 5a = 10a
Substitute a = 7:
10(7) = 70
b. 3a + 7a
Combine like terms:
3a + 7a = 10a
Substitute a = 7:
10(7) = 70
c. 17 + 5a + 3a
Combine like terms:
5a + 3a = 8a
Add the constants:
17 + 8a
Substitute a = 7:
17 + 8(7) = 17 + 56 = 73
d. 6a - a + 2
Combine like terms:
6a - a = 5a
Add the constants:
5a + 2
Substitute a = 7:
5(7) + 2 = 35 + 2 = 37
i. First simplify the following expressions, then determine the value of the expression by substituting a = 7.
a. 13a+2a—5a b. 3a+7a
b. 3a+ 7a
c. 17 +5a+3a d. 6a—a+2
d. 6a-a+2
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