2х3+10х+2у2-х-у=2х3+9х+2у2-у=2*3in3+9*3+2*5in2-5=2*27+27+2*25-5=54+27+50-5=126
You can use the equation y=.1(x-1)+.35 to solve, where y is the cost in dollars and cents and x is the total number of boxes.
Y=.1(5-1)+.35
Y=.1(4)+.35
Y=.4+.35
Y=.75
The cost to ship is $0.75
D) 8.7lbs
Subtract $2.50 from the total cost, because that's a fixed number, then do more math and boom, just like magic, it's solved.
You probably just need to simplify the expression. To do this you just combine like terms. So you would subtract 38 from the 10 to get -28x and then subtract 47 from 36 which gives you -11. Your expression should be -28x-11.<span />
Answer: 8(x-4) 8 was the common term. So just pull out the 8.