PLEASE HELP WILL GIVE BRAINLIEST!! Define a variable and write an equation. Then Solve.

A student is taking a test. He has 37 questions left. If the test has 78 questions, how many questions has he finished?

Need solving this second acceleration problem.

Acomposition of transformations maps δxyz to δx"y"z". the first transformation for this composition is , and the second transformation is a 90° rotation about point x'.

Suppose you are choosing a 6-digit personal access code. this code is made up of 4 digits chosen from 1 to 9, followed by 2 letters chosen from a to z. any of these digits or letters can be repeated. find the total number of personal access codes that can be formed. 492,804 341,172 39,917,124 4,435,236