HELP ME PLEASE! (9 POINTS) The approximate composition of naturally occurring magnesium is as follows:
79% magnesium-24, 10% magnesium-25, and 11% magnesium-26. Calculate the atomic mass of magnesium. Show your work.

Solve the equation using the given values: x= -2.5; y= -7.51. 2xy + 2x²

Which two undefined geometric terms always describe figures with no beginning or end?

Match the following reasons with the statements given to create the proof. 1. do = ob, ao = oc sas 2. doc = aob given 3. triangle cod congruent to triangle aob vertical angles are equal. 4. 1 = 2, ab = dc if two sides = and ||, then a parallelogram. 5. ab||dc if alternate interior angles =, then lines parallel. 6. abcd is a parallelogram cpcte