Q.14 -A person covers a certain distance on scooter at a speed of 48 km/h. But comes back along the same path by car at a speed of 72 km/h. His average speed for the up and down journey is

Find the difference (8ab+a+2) - (3ab+6)

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?

Which answer goes into the box? (90° clockwise rotation, 90° counter clockwise rotation, translation, or glide reflection)