Most graphing calculators will do weighted averages pretty easily. It is mostly a matter of data entry.
mx = -2
my = 10
(x, y) = (mx, my)/10 = (-0.2, 1)
we are given
total number of apples =54
Let's assume each friend receives =x
He kept a apples for himself and gave each of 6 friends an equal number of apples
so, we will get equation as

now, we can solve for x

each friend receives is 9 apples.........Answer
We have to multiply those measurements to get the area of a living room
10.6 ft * 9.28 ft
98.368 ft^2
Tom is spending more on tax totaling 23.54
while his cousin is only spending 18.72
How to get tax with percent take base price ex:22+ 7%
transform percent into a decimal : .07
now multiply the decimal times base price : 22x0.07
tax is a $1.54 now add that to your base price 22
and you get your total $23.54