13. the amount earned (in dollars) for recycling p pounds
of copper is 2p. how much do you eam for recycling
28 pounds of copper?

Money earned for recycling 28 pounds of copper is $ 56                  

Step-by-step explanation:

Cost of a given substance is the amount of money obtained or received for selling a given substance. The total money received for selling a given number of units or a given amount of substance is equal to the total number of units multiplied by the cost of one unit.

Given: The money earned for recycling p pounds  of copper = 2p

Let the money earned for recycling 28 pounds  of copper be $ x

As, Money earned for recycling p pounds of copper = 2p

So, Money earned for recycling 28 pounds of copper = $ x

⇒ x = 2p × 28 ÷ p = $ 56

Therefore, money earned for recycling 28 pounds of copper is $ 56.

right

step-by-step explanation:

3

step-by-step explanation:

in standard form:

a= dictionaries

b= maps

you have to buy 3 dictionaries, so put a 3 next to the a (dictionaries) so that you can multiply them by each other.

a3+b= 60 (the amount of money you have)

we already know the cost of a=15 so replace a with $15

($15 x 3)+b=60

multiply 15 and 3 to get $45 and replace it with $45

45+b=60

and then replace b with 15 to get the total:

45+15=60

that means you have $15 left after buying 3 dictionaries.

15 divided by the cost of a map ($5) equals 3.

so you can buy 3 maps.

sorry if it was confusing!