Ben is 3 times as old as daniel and is also 4 years older than daniel. how old is daniel

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

Parabolas y=−2x^2 and y=2x^2 +k intersect at points a and b that are in the third and the fourth quadrants respectively. find k if length of the segment ab is 5.

Another type of subtraction equation is 16-b=7. explain how you would sole this equation then solve it.