Skateboard revenue: a skateboard shop sells about 50 skateboards per week for the price advertised. for each $1 decrease in price, about 1 more skateboard per week is sold. the shop's revenue can be modeled by y=(70-x) (50+x). use vertex form to find how the shop can maximize weekly revenue.
[i can get this into vertex form, but i'm not understanding how to read the vertex form of the equation to answer the question]

d

step-by-step explanation:

d

answer: the sun

explanation:

water cycle describes the evaporation of water from earth's surface, formation of clouds and precipitation water back onto the surface of earth. seventy percent of the earth is covered with water in the form of seas and oceans. the heat of the sun causes the evaporation of water from the surface of the ocean. the water vapors rise and condense to form water droplets. the collection of these water droplets form clouds which rain down again.

the evaporation of the oceans surface water as part of the water cycle is caused by the sun