If b = 1/2x −1/y, then what is an expression for 2/b in terms of x and y?

2/xy

Step-by-step explanation:

you have to do the math but im not very sure on this

15.5

step-by-step explanation:

5

∑

n = 1

substitute n = 1, 2, 3, 4, 5 and sum the terms

= + + + 2² + 2³

= 0.5 + 1 + 2 + 4 + 8

= 15.5

f(x) has value 150 at x= 0

and 0 at x= 3

so d(f(x))/dt = slope = -150/3 = -50