Answer:
hx,= 2x-7
h8 = 2(8) -7
= 16-7
= 9
34=2x + 16
18=2x
x=9
Robert used 9 grams of iron filings in his first experiment.
y = k/x
5 =k/7.5
k = 7.5/*5= 37.5
answer is D
+2
Step-by-step explanation:
+ and - cancel. We have 5 + and 3 - so that leaves us with 2 + so the answer is +2.
