A 4th grade class took a field trip to a science museum. There are 24 students in the class. Each student purchased a $9 ticket for the museum and a box lunch, which was also $9.
Estimate the total cost of the field trip.

Ten times the square of a non-zero number is eqaul to ninety times the number

Could someone with number 1 and 2

You are standing next to a really big circular lake. you want to measure the diameter of the lake, but you don't want to have to swim across with a measuring tape! you decide to walk around the perimeter of the lake and measure its circumference, and find that it's 400\pi\text{ m}400? m. what is the diameter dd of the lake?