Pls someone me with part b and their is 5.6 acres

An appliance store sells a washer-dryer combination for $1800. if the washer costs $300 more than the dryer, find the cost for each appliance.

Four quarts of a latex enamel paint will cover about 200 square feet of wall surface. how many quarts are needed to cover 98 square feet of kitchen wall and 52 square feet of bathroom wall

For a function f(x), a) if f(7) = 22 then f^-1(22) = b) f^-1(f(c)) =