Answer:
Length: 48
Width: 12
Step-by-step explanation:
Substition
l - 2w = 24
I = 60 - w
60 - w - 2w = 24
60 - 3w = 24
-3w = -36
w = 12
Substitute it into the equation to get the length.
l = 60 - 12
l = 48
A-b=21
5a-2b=18
We can use substitution here. Take the first equation and solve for A. (Picking this one because it's easy)
a = 21+b
Plugin to the second equation:5(21+b)-2b=18
Simplify: 105 + 5b - 2b = 18
Simplify: 105 + 3b = 18
Subtract both sides: 3b = 18-105
Simplify: 3b = -87
Divide: b = -29
Plug back into the first: a=21+b
a = 21 - 29
a = -8
Option D
45 percent because it's purpose is not to make light, but heat. Since that is excess wasted energy, you would subtract the wasted energy from the units of energy used for the desired task (50-5) and it would give you 45
C. -10
(20+2x)/(5-x)
Multiply both sides by lowest common denominator, simplify
2x + 20 = 0
2(x + 10) = 0
factor out 2 from 2x+20
Well I think it is F bc it is asking to compare the two numbers of the books that Mary and Paul have not adding
