A total of 15 guests attended a birthday party. Three friends stayed after the party to help clean up. How many left when the party ended? To solve this problem, let x represent the:

3.4 pizzas

step-by-step explanation:

given is a scatter plot showing number of pizzas sold during weeks for different issues of coupon

y represents number of pizzas sold and x number of coupons issued

y is marked verticaly and x horizontally

the trend line is given as

y =3.4x+43

this says that even when no coupon is issued pizzas sold will be 43

and rate of change of pizza sold for 1 unit of coupon = slope = 3.4

i.e. when x increases by 1 unit y increases by 3.4 units

hence for each additional coupon issued 3.4 pizzas more will be sold

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step-by-step explanation: vsfdvsfvd

step-by-step explanation:

part a: 1.08

part b: 27.59