2(12x + 16y) + 5(3y +4z) + 7(6x – 3y - 2z)

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.

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)

Awater truck is filling a swimming pool. the equation that represents this relationship is y=19.75x where y is the number of gallons of water in the pool and x is the number of minutes the truck has been filling the pool.