Answer:
x=-2
Step-by-step explanation:
-2x=4
Divide each side by -2
-2x/-2=4/-2
x = -2
Answer:
Step-by-step explanation:
x + y = 4 ---------------(i)
x = 4-y
7x + 9y = 42 -----------(ii)
Plug in x = 4-y in equ (ii)
7*(4 - y) + 9y = 42
28 - 7y +9y = 42
28 + 2y = 42
2y = 42 - 28
2y = 14
y = 14/2
y = 7
x = 4 - y
x = 4 - 7
x = -3
I am pretty sure it is (c). I used a formula, ( 25.00+(2.50*n))
substitute the variable "n" for the number of deliveries made.
The thickness of a US penny is reported to be 0.0598 inches.
Then a stack 8 ft high will require
.. (96 in)/(0.0598 in) ≈ 1605 . . . pennies
_____
Perhaps a few more if they are worn.