Wally buys a baseball card for $5, sells if for $6, buys the same card back for $7 the following days, and then resells it for $8. How much profit or loss occurred in all these transactions combined?

3 dollars profit

Step-by-step explanation:

if he has $5 b-card and sells it for $6 he gains a dollar. But if he buys it back for $7 then he lost $2 from his original price. In the end, he sells it for $8 so he gains a $3 profit. 8 - 5 = 3

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

step-by-step explanation:

you can add the two numbers and divide the result by 2. or you can find the gap between the two numbers and add half of this to the smaller number.