The width of a rectangle is the length minus 4 units. The area of the rectangle is 21
units. What is the width, in units, of the rectangle?

Step-by-step explanation:

let the Length= L

      Area of a rectangle= Length* Width

                                 21=L*(L-4)

The length cannot be negative so, Length = 7 units

Width=Length-4

Width=7-4= 3 units

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

it’s supposed to be -4+45=41

step-by-step explanation: