Answer:
How does it need solved? By graphing? Substitution?
Step-by-step explanation:
Answer:
For number 1: y=2 and x=3
-10x=-12x + 21 + 11
-10x= -12 + 32
-10x + 12x = 32
2x = 32
X = 32/2
Simply using the given formula ,
I = P × R × t
I = 100 × 10/100 × 3
I = $30
David purchased some cookies at the cost of
5 for $4 (5/4=1.25) and
sold them at 4 for $5(4/5=0.80).
To find cost per cookie subtract 1.25-0.80=0.45
David made a profit of $180 in total ( divide profit per cookie cost: 180/0.45= 400)
How many cookies did David purchase to make that much money?
He needed to make 400 cookie to make the profit of $180.