One number is 7 more than another. the difference between their squares is 217.what are the numbers?

19 and 12

Step-by-step explanation:

Let a and b be these numbers.

1. If one number is 7 more than another, then

2. If the difference between numbers squares is 217, then

3. Solve the system of two equations:

Add these two equations:

Then

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