What is the next number? 3 4 6 9 13 18 24

Someone answer this asap rn 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)) =

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

Arectangle has a width of 5 cm and a length of 10 cm. if the width is increased by 3, how does the perimeter change?