Store buys phones for $12 sells them at a markup of 250%. If the markup rate is the constant of proportionality in the equation y = kx write an equation that can be used to find the markup on the cost x of a phone.

You are a clerk at convenience store. a customer owes 11.69 for a bag of potatoes chips. she gives you a five dollar bill. how much change should the customer receive?

Is the power produced directly proportional to the wind speed, give reasons for your answer?

Alina fully simplifies this polynomial and then writes it in standard form. xy2 – 2x2y + 3y3 – 6x2y + 4xy2 if alina wrote the last term as 3y3, which must be the first term of her polynomial in standard form? xy2 5xy2 –8x2y –2x2y