7. People living in Florida sometimes find that the water in their swimming pools becomes uncomfortably warm during the summer months. This situation can be rectified
by adding ice cubes to the pool. The following authentic formula can be used to
determine the approximate number (N) of 5-pound bags of ice required to reduce the
temperature of a pool by D degrees Fahrenheit if the volume of the pool is V cubic feet:
N = 0.06125DV. Gomer’s pool is roughly rectangular in shape, with a length of 50 feet,
width of 20 feet and average depth of 5 feet. How many bags of ice will be required to
reduce the temperature of the pool by 10°?

PLEASE EXPLAIN HOW!

Solve 2x+y=3 x+y=5 in substitution method

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.

Someone answer asap for ! a discount store’s prices are 25% lower than department store prices. the function c(x) = 0.75x can be used to determine the cost c, in dollars, of an item, where x is the department store price, in dollars. if the item has not sold in one month, the discount store takes an additional 20% off the discounted price and an additional $5 off the total purchase. the function d(y) = 0.80y - 5 can be used to find d, the cost, in dollars, of an item that has not been sold for a month, where y is the discount store price, in dollars. create a function d(c(x)) that represents the final price of an item when a costumer buys an item that has been in the discount store for a month. d(c(x)) =