Cody is saving money for a new skateboard that cost $77.99.he already has $20 in his saving account. he earns $6 for every lawns a weekend, how long will take him to save enough money for the skateboard?

Plz which expression is equivalent to the expression below?

Phillip had some bricks. he stacked them in 6 equal piles. which expression shows the number of bricks phillip put in each pile? let the variable m stand for the unknown number of bricks. m + 6 m÷6    m−6    6m

Aprojectile is thrown upward so that its distance above the ground after t seconds is given by the function h(t) = -16t2 + 704t. after how many seconds does the projectile take to reach its maximum height?