Determine whether quantities vary directly or inversely and find the constant of variation. a teacher grades 25 students essays in 4 hours. assuming he grades at the same speed, how long will it take him to grade 35 essays?

What is the slope of the line that contains the points (4,8) and (9,8)? what type of line is it?

Prove the divisibility of the following numbers: 25^9 + 5^7 is divisible by 30.also, read as (25 to the power of 9) + (5 to the power of 7) is divisible by 30. blank x 30what is the blank? ( it should be expressed in exponent form)

A25- foot ladder leans against a building and reaches a point of 23.5 feet above the ground .find the angle that the ladder makes with the building