35 would be positive while 40 would be negative
If you have |a|=b, solve a=b and a=-b
so
|-4+5x|=16
so solve
-4+5x=16 and -4+5x=-16
add 4 to both sides
5x=20 and 5x=-12
divide both sides by 5
x=4 and x=-12/5
the 2 solutions are x=-12/5 and x=4
It is showing that there is an exponent. For example, if you saw 4^2 it would mean four to the second power or four squared.
With 37 mangoes you can bake 12 fruit tarts, because you need 3 mangoes for each tarts and you'll use
mangoes. The remaining mango is not enough for another tart.
On the other hand, in order to bake 12 tarts, you'll need 24 apples, because you need 2 apples per tart.
So, with 12 apples and 37 mangoes you can bake 12 tart, with one mango as leftover.
Answer:
2.pi.r = 2.pi.10 = 20.pi units