17 points for anyone who can solve all these 1) a certain retailer of toys marks merchandise up 40% from what they pay for it. in other words, if they pay $2.00 for a toy, they charge $2.80 for it. they charge $47.95 for a model train set. how much did it cost the retail store? 2) darren loaned money to a coworker for two years at 15% interest. it was an $825 loan. how much money will the coworker have to pay back at the end of the two years? 3) a certain retailer of hair supplies marks merchandise up 160% from what they pay for it. in other words, if they pay $20.00 for a bottle of hair product, they charge $52.00 for it. they charge $63.18 for a color maintenance kit. how much did it cost the retail store?

i know numer one is 19.80

first option

a function is a relation in which an input is paired with exactly one output.

so, let's find the right answer.

in our first option, our inputs are january, february, and march. the outputs are 30, 28, and 25. each input has it's own output. this is correct!

our second option we know is incorrect, because ms. valverade has two outputs, dogs and cats. this is not a function.

our third option is incorrect as well. the yellow square has two ouputs, the square and the triangle.

lastly, in our fourth option, we see the number 7 two times with a different output. therefore, this is not a function.

remember: each input must be paired with only one output!

throw the computer

step-by-step explanation: