Answer:
17
Step-by-step explanation:
Pythagorean formula
a²+b²=c²
in other words, sidea²+sideb²=hypotenuse
8²+15²=c²
64+225=c²
289=c²
√289=√c²
17=c
25 because you would just get rid of the 2/3
Answer:
D $11.63
Step-by-step explanation:
How you do this problem is that you first find out how much the price has gone down.

Then, you divide 9.82 by the answer to your previous equation and then you have completed the question!
You can use elimination
x - y = 7
0.5x + y = 5
1.5x = 12
x = 8
Then plug in x into one of the original equations
8 - y = 7
y = 1
Solution is (8,1)