Which statements include two quantities in the real world that are additive inverses? Select each correct answer.

A helium atom has 2 positively charged protons and 2 negatively charged electrons.

Gabriella charges $300 on her credit card and then pays the $300 credit card bill.

A scuba diver descends 40 m from sea level and then descends another 10 m.

Mia walked 5 mi north and then walked 5 mi west.

Given f(x)= 9x+1 and g(x)=x^3, choose the expression (f*g)(x)

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)) =

How do i i solve this equation? -18 = x/3 + 3