The diameter of a circular platemat is 42 centimeters.
what is the approximate area of the circular placemat?

The manufacturer of a new product developed the following expression to predict the monthly profit, in thousands of dollars, from sales of the productwhen it is sold at a unit price of x dollars.-0.5x^2 + 22x - 224what is represented by the zero(s) of the expression? a.the profit when the unit price is equal to 0b.the unit price(s) when the profit is equal to 0c.the profit when the unit price is greatestd.the unit price(s) when profit is greatest

Nine more than four times a number is the same as one less than twice the number. find the number?

What is the range? can’t seem to find it out