There are 1,400 students in a school. a random sample of 50 students contains 7 students with birthdays in march. about how many students in the school have birthdays in march?

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

Which expression is equivalent to 2x^2+7x+4?

Which math sentence can be used to determine if the triangle is a right triangle?