Answer:
He sold 100 rackets for $ 20
Step-by-step explanation:
To start, we have to make 2 equations, one that represents the number of rackets and the other the money
x + y = 500
x * 20 + y * 45 = 20000
we clear x in the first equation
x + y = 500
x = 500 - y
we replace x in the second equation with (500 - y)
x * 20 + y * 45 = 20000
(500 - y) * 20 + y * 45 = 20000
10000 - 20y + 45y = 20000
-20y + 45y = 20000 - 10000
25y = 10000
y = 10000/25
y = 400
we replace x in the first equation with the value obtained
x = 500 - y
x = 500 - 400
x = 100
He sold 100 rackets for $ 20
Answer(s):
31:
4.5 = 4 + 1/2 (0.5)
32:
23.7 = 20 + 3 + 7/10 (0.7)
33:
6.9 = 6 + 0.9
34:
35.4 = 30 + 5 + 0.4
it's kinda implied :)
Good Luck Dude.
I'm assuming you mean #10?
So we're given this equation:

In this equation, we a variable of <em>b</em>. We want to solve for <em>b</em> by isolating it, or setting it alone. We see that on the side with <em>b</em> on it, it is being subtracted by 5. We want to the opposite in order to isolate <em>b</em>.
Remember that when you do one thing to one side of the equation, you
must do it to the other side as well. We can add 5 on both sides to cancel out the negative 5 on the left.

Therefore we know that <em>b</em> does
not equal -10, which can be represented as:

So you have to (a) color the hair yellow.