If x is a whole number and 437 = (21 + x)(21 - x), then x =

2

Step-by-step explanation:

In general, .

So we have here that:

We went by itself first.

Subtract 441 on both sides:

Multiply both sides by -1:

Take the square root of boht sides:

So both 2 and -2 would satisfy the equation.

Only one of these is a whole number.

The whole numbers consist of the elements that you can count with and 0.

The whole number set is {0,1,2,3,4,5,6,7,...}

So 2 is the answer.

Check:

Replace x with 2:

437=(21+2)(21-2)

437=(23)(19)

437=437 is a true equation so 2 is definitely a solution.

coins of silver or gold

step-by-step explanation:

correct choice is b

step-by-step explanation:

when you calculate the average rate of change of a function, you are finding the slope of the secant line between the two points. for the function the average rate of change from point to point can be calculated as

to find the average rate of change from day 2 to day 10, note that at day 2, 8 houses were sold, so a(2,8) and at day 10, 2 houses were sold, so b(10,2). thus,