Answer:
volume of a cube = 441cm3.
l³=441cm³
l=7.6cm
Answer:
16
Step-by-step explanation:
Answer: Option B
B. 
Step-by-step explanation:
We have the following equations:
(1)
(2)
Let us call "a" the coefficient of the variable x in the first equation and call "b" the coefficient of the variable x in the second equation.
Then we must multiply the number "a" by a value z such that when adding
the result is zero.

So

We solve the equation for z


The first equation must be multiplied by a value of 
Cost of the basic car bought by John Gray = $8250
Optional cost incurred after buying = $324
Total cost before tax = 8250 + 324
= $8574
Percentage of sales tax incurred = 6%
Amount of sales tax charged = (6/100) * 8574
= $514.44
License and registration fees paid = $50
John's total cost = 8250 + 324 + 514.44 + 50
= 9138.44 dollars
From the above deduction, it can be easily concluded that the correct option among all the options that are given in the question is the first option or option "A".