How many negative roots can this function h(x)=x^3-7x^2-x+7

One number is 4 less than 3 times a second number. if 3 more than two times the first number is decreased by 2 times the second number, the result is 11. use the substitution method. what is the first number?

240 seventh graders and two-thirds of the students participate in after-school activities how many students participate in after-school activities

Is experimental probibilty the same as the observed frequency in math? i need the answer asap!