An online retailer charges $6.99 plus 0.55 per pound
to ship electronics purchases. how many pounds is a dvd
player for which the shipping charge is $11.94?

9 lb

Step-by-step explanation:

Set the equation. First, write the expression out:

An online retailer charges $6.99 plus $0.55 per pound.

Note that $6.99 is a one-time charge (the constant), and so it is added on.

$0.55 is connected to the variable of pounds, for you do not know how much pounds there are in all.

Set the equation based on information provided:

Total Cost = Constant + (Cost per pound x Amount of pounds).

Note that:

Total Cost = $11.94

Constant = $6.99

Cost per pound = $0.55

Amount of pounds = x

Plug in the corresponding numbers & variables to the corresponding terms:

11.94 = 6.99 + (0.55x)

Isolate the variable, x. Note the equal sign, what you do to one side, you do to the other. Do the opposite of PEMDAS. First subtract, then divide:

11.94 = 6.99 + 0.55x

11.94 (-6.99) = 6.99 (-6.99) + 0.55x

0.55x = 11.94 - 6.99

0.55x = 4.95

Divide 0.55 from both sides to fully isolate the x:

(0.55x)/0.55 = (4.95)/0.55

x = 4.95/0.55

x = 9

9 lb is the amount of pounds of the DVD player.

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step-by-step explanation:

5x+2x=49

7x=49

x=7. 35 apples