Set of all positive whole numbers

This semester, she will spend a total of 27 hours in the chemistry lab, and she will take notes in class 7 hours each week. Is this a subtracting sentence or a adding one? Btw sorry for wasting your time i just need this done for tommorow so yea.

A jeweler sells gems at a cost in dollars per centigram that is 4 more than 6 times the weight of the gem in centigrams.

You shop for bikes and find 7 types priced at $119,$139,$149,$179,$189,$199, and $209. You want to buy the $189 bike. Should you use the mean, median or mode to convince your parents that this is a reasonable price for a bike?

1200 calories in 3 liters. Write a unite rate.

Alice walks 6/10 mile everyday how many miles does she walk in 5 days? A. 25/10 B. 20/10 C. 30/10 D. 30/50

Solve for m: (5m-3n) / q=f

Solve 49x^2+64=0 by using square roots

Simplify the algebraic expression. y2 + 11y - 6y + y2

What is the answer to 2/4=/2

Six less than 5 times a number is 24, i just need the equation