Answer:
$1,440 is used to buy referenced books.
Step-by-step explanation: 36% of $4,000 is $1,440
Answer:
He could use y+3x=-4
Step-by-step explanation:
When we subtract 3x on both sides, we get y=-4-3x, which means we just solved a variable and can substitute into the other equation 2x-3y=-21
Answer:
Jack is 31
Lacy is 10
Step-by-step explanation:
x - 9 = 22
since jack is 3 times as old as lacy,
the formula is
3x - 9 = 22
3x = 31
x = 10.3
So Jack is 31
And Lacy is 10
To prove this, subract 9 (years) from both ages
It will give you an approximate sum of 22 years for both their ages, as the question states
Since Lacy is a little over 10 years old, Jack is 31 instead of 30
The formula was taken from someone elses answer so sorry if it`s wrong
Answer:
About 163 (Exact Answer: 163.1)
<h2>
Step-by-step explanation:</h2>
11.3s + 10.5t
Replace s with 7 and t with 8.
11.3(7) + 10.5(8)
Multiply.
11.3(7) + 10.5(8) =
79.1 + 84
Add.
79.1 + 84=
163.1 ≈ 163