18 students are 1/10 of the number of seventh graders


First choice.
Answer:
39.92
Step-by-step explanation:
10%=4.99
20%=9.98
49.90-9.98=39.92
Answer: im pretty sure this is correct
- 1/42 x (21x233y)
Step-by-step explanation:
first convert the expressions (2 3/10x x5/7 x y-2 4/5 x x )
then factor the expression (23/10 x- 5/7 y- 29/6 y- 14/5x )
then collect like terms (1/210 x 483 x - 150 y - 1015 - 588x)
factor the expression (1/210 x 105x 1165y)
Multiply reduce (1/210 x -5 (21x + 233y ))
= -1/42 x (21x233y)
Answer:
900 batteries
Step-by-step explanation:
First we must find how many batteries does 1 calculator need
we can do this by dividing 160 by 40
which will give us 4 batteries per calculator
then we multiply the amount of calculators we have with 4
225×4 = 900 so we need 900 batteries