7. lawn chair: $15, 25% off, 6% tax

$3.75 + 6% tax

$3.75

tax: $0.22

Total price with sales tax: $3.97

Step-by-step explanation:

28

Step-by-step explanation:

because the people who are in the middle of the day are not going to be able to do that to you take the time to think about it

60ways

Step-by-step explanation:

This has to do with selecting whereas combination deals with selection. If we are selecting r objects from the total number of n objects, we will have nCr = n!/(n-r)!r!

If we are picking 2 blue balls from 5red balls, we have 5C2 = 5!/3!2!

5C2 = 5×4×3!/3!2!

5C2 = 10ways

Similarly, picking 1 white ball from a total of 3balls, we have 3C1

3C1 = 3×2×1

3C1 = 6ways

Picking 2 blue balls and 1 white ball at once results in 5C2 × 3C1 = 10×6 = 60ways