There are 850 students in a school. Find the number of boys if the number of girls is 56 less than the boys.

If a+b+c=0;what is(b+c)(b-c)+a(a+2b)

If (q)=9q^₂ +tq+5; if (1)=21;find it?

The difference between 5 times a certain number and 2 times the same number is 36. The number is:

A number is greater than 3 but less than 8. Also it is greater than 6 but less than 10.The number is