What information would you have to know to determine the toughness of a solid?

how much kinetic energy it absorbed before it broke
its mass and volume
what materials are able to scratch it
its mass

Christie's doctor recommends that she eat 40 grams of protein a day. she's already consumed 50% of her protein recommendation for the day. how many servings of the given snack should christie have to meet her daily protein recommendation?

Ascientist and her team counted 200 individual deer in an area of 10 square kilometers. what is the population density?

What are two ways in which waves erode the land?