Find the limit of the function by using direct substitution. limit as x approaches zero of quantity x squared plus four

Determine the number of girls in a math class with 87 boys if there are 25 girls for every 75 boys

Awater truck is filling a swimming pool. the equation that represents this relationship is y=19.75x where y is the number of gallons of water in the pool and x is the number of minutes the truck has been filling the pool.

The graph of f(x) = |x| is transformed to g(x) = |x + 11| - 7. on which interval is the function decreasing?