If 75% of the students in toby’s grade voted, how many students are in toby’s grade?

Ihave a 69 and an 82. the 69 is worth 40% of my grade and the 82 is worth 15%. can someone tell me my current average grade.

Students are given 3 minutes for each multiple-choice question and 5 minutes for each free-response question on a test. there are 15 questions on the test, and students are given 51 minutes to take it.how many multiple-choice questions are on the test?

An objects motion is described by the equation d= 4sin (pi t) what will the height of the object be at 1.75 seconds?