PLEASE HELP!!1
Four intersecting lines, t, v, u, and w, are shown in the diagram.

Explanation:

Line w and line t are parallel if and only if the corresponding angles (4x+60) and (9x) are congruent.

9x = 4x+60

9x-4x = 60

5x = 60

x = 60/5

x = 12

If x = 12, then

9x = 9*12 = 108

4x+60 = 4*12+60 = 48+60 = 108

Both corresponding angles would be 108 degrees if x = 12. So this confirms we have the right x value.

phosphate, calcium ion, chloride ion, neon atom

step-by-step explanation:

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.