A student carries out the 'energy in food' investigation. She repeats the same food type four times. She gets the following temperatures in degrees Celsius. Calculate the average (mean) 56, 61, 54, ,48

its a straight line parallel to the time axis

use distributive property on all like terms and change your signs if you have a double negative or if you have positive/negative

the revenue of the fitness center, y, is the product of two factors: the number of members and the fee paid by each member. there are 320 members now, but number of members goes down by 10 for each $5 increase in fees, so if x is the number of $5 price increases then members is equal to (320 - 10x). since the fee is currently $45, and the fee increases by $5 for every price bump x, the fee is given by (45 + 5x). so, revenue y is given by y = (320 - 10x)(45 + 5x).