If a number is tripled and then subtracted form 28, the result is 3 more then twice the number. what is the number

Determine which expressions represent real numbers and which expressions represent complex number. asaaap! plis!

Plot a point at the y-intercept of the following function on the provided graph. 3y=-5x+7 20 points

Need to finish my juan wants to build a greenhouse in his back yard. he needs to maximize the ratio of floor area to structure volume in order to provide the most room for plants while minimizing the area to be heated. find the description of the structure that best meets juan’s criteria. a.) a hemisphere with a diameter of 12 feet b.) a cube with a side length of 12 feet c.) a cone with a diameter of 12 feet and a height of 10 feet d.) a square pyramid with a base side length of 12 feet and a height of 9 feet