What is w+ 1/x + 1/y + 1/z if w=20, x=23, y=19, and z=28

Sienna planned a trapezoid-shaped garden, as shown in the drawing below. she decides to change the length of the top of the trapezoid-shaped garden from 32 ft to 24 ft. which expression finds the change in the scale factor?

The sum of 5consecutive even numbers is 100. what is the first number in this sequence?

Can someone me and explain..will award brainlest!