Answer:
(t-8)+10
Step-by-step explanation:

3*boys=2*18
3*boys=36
boys=12
12+18=30
total number of students: 30
Answer:
8.06
Step-by-step explanation:
Use the Pythagorean theorem:

The hypotenuse is always the slanted side, or c (x in this picture), but the other numbers can be interchanged. Doesn't matter.
Plug the numbers 4 and 7 into the formula.

Now evaluate them to get 
16+49=65
To get c, take the square root of 65

The ratio of sediment yield of a drainage basin to the total amount of sediment moved by sheet erosion and channel <span>erosion.</span>