For a standard normal distribution, which of the following expressions must always be equal to 1?
a) p(z≤-a)-p(-a≤z≤a)+p(z≥a)
b) p(z≤-a)-p(-a≤z≤a)+p(z≥a)
c) p(z≤-a)+p(-a≤z≤a)-p(z≥a)
d) p(z≤-a)+p(-a≤z≤a)+p(z≥a)

Tabby sells clothing at a retail store, and she earns a commission of 6.25% on all items she sells. last week she sold a pair of jeans for $32.50, a skirt for $18.95, and 2 blouses for $14.95 each. what was tabby's total commission? a $4.15 b $5.08 c $81.35 d $348.60

Select the correct answer from each drop-down menu. the length of a rectangle is 5 inches more than its width. the area of the rectangle is 50 square inches. the quadratic equation that represents this situation is the length of the rectangle is inches.

The function show two sisters' savings account and the rate at which they plan to deposit money