Devaughn is 15 years older than Sydney. The sum of their ages is 107. What is Sydney's age?

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

Teams of 4 are competing in a 1/4 mile relay race. each runner must run the same exact distance. what is the distance each teammate runs?

Aright triangle has an area of 21 m2. the dimensions of the triangle are increased by a scale factor of 4. what is the area of the new triangle