Please help me i give 5* along with thanks for quality answer

For each proportion find the unknown number x 1/5/8=×/15

Which inequality statement describes the two numbers on a number line? "? 7 and a number 5 units to the right of ? 7"

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?