I will mark the brainliest if you get this right. It's very easy but also a bit tricky. A boy is just turned 14 years old today, he asked his grandpa how old is her, she said she is 78 now. How many percent did the boy live in her grandma's age?

You’re repairing a large rectangular aquarium. the final step is to cover the glass with a protective film. the front and back of the aquarium measure 4 meters by 2 meters, and the sides of the aquarium measure 3 meters by 2 meters. how many square meters of protective film do you need? ( )

Could somebody me with this radical simplification?

15 and 14.7 are 1 apart, so 15 – 14.7 must be 1.