They purchased a total of 1 13/18 pounds.
Let's write it down:
<span>"60 is 75% of s" means:
60=75%*s
75% is

, (percent just means "out of 100" so we just divide it by 100) so we can also write:
60=</span><span>

s
now, let's multiply both sides by 4:
240=3s
and divide by 3:
80=s
So we have the result that the original value, s, is 80!
</span>
(5 | -2) should be the solution of the equations
So it workt for c)
c)
3*(5) - 5*(-2) = 25
(5) + 5*(-2) = -5
Just pretend it’s a 3d right angle triangle and find the length of the hypotenuse.
d = sqrt(6^2 + 10^2 + 15^2) = 19