Help me with algebra please

A gardener is planting two types of trees:
Type A is 3 feet tall and grows at a rate of 22 inches per year.
Type B is 3 feet tall and grows at a rate of 21 inches per year.
Algebraically determine exactly how many years it would take for these trees to be the same height.

You are making a battery for a science project. you have copper wire for your first electrode. you need to choose a conductor, a second electrode, and a device to plug into your battery. you have already chosen a lemon conductor. complete each statement below about the options that include a lemon conductor.

Suppose that the price p (in dollars) and the weekly sales x (in thousands of units) of a certain commodity satisfy the demand equation 4p cubedplusx squaredequals38 comma 400. determine the rate at which sales are changing at a time when xequals80, pequals20, and the price is falling at the rate of $.20 per week.

Look at this pattern ; 1,4,9, number 10000 belongs in this pattern . what’s the place of this number?