The boundary of a lamina consists of the semicircles y = 1 − x2 and y = 4 − x2 together with the portions of the x-axis that join them. find the center of mass of the lamina if the density at any point is proportional to its distance from the origin.

Afactory adds 3 red drops and 2 blue drops of coloring to white paint to make each pint of purple paint. the factory will make 50 gallons of the purple paint.how many drops of red and blue coloring will the factory need in the 50 gallon batch of purple paint.

One number is 4 less than 3 times a second number. if 3 more than two times the first number is decreased by 2 times the second number, the result is 11. use the substitution method. what is the first number?

Ithink i know it but i want to be sure so can you me out ?