Given a normal distribution with μ=30 and σ=7, find (a) the normal curve area to the right of x=17; (b) the normal curve area to the left of x=21; (c) the normal curve area between x=32 and x=42; (d) the value of x that has 85% of the normal curve area to the left; and (e) the two values of x that contain the middle 75% of the normal curve area.