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
Just remember that the word "of" means "multiply" in mathematical terms
Now lets get started working out this problem of yours

Also, remember:

and down is rounded to

|

and up is going closer to
Divide both sides by
:

If
, then

and more generally, for any integer
,

So, 350 out of 1750
350/1750=
.1828/1
percent is parts out of 100 so x%=x/100
make bottom number 100
0.1828/1 times 100/100 =18.28/100=18.28%
about 18% saved