Answer:
D
Step-by-step explanation:
To determine which expression has a value of 15 when n = 7
dubstitute n = 7 into the expression and evaluate
A
43 - 5n
= 43 - 5(7)
= 43 - 35 = 8 ≠ 15
B
3n - 5
= 3(7) - 5 = 21 - 5 = 16 ≠ 15
C
6n - 28
= 6(7) - 28
= 42 - 28 = 14 ≠ 15
D
19 - [tex]\frac{28}{n}[/tex]
= 19 - [tex]\frac{28}{7}[/tex]
= 19 - 4
= 15
Thus D has a value of 15 when n = 7
