The ratio of boys to girls is 4:5 what is the ratio of boys if the total is 81 students?

A couple has 10 children. What is the probability that 7 of these are girls?

If x = 3, y = - 5 and z-7, find x + yz + xyz.

Pick a number from the following list: 1 2 3 4 write it down. if each student in the class of 50 were also to pick a number, how many would you guess has selected the same number as you did?

Estimate square root of 88

Adel started her homework at 9:10 she finished at 9:45 how long did she spend in her homework

How many edges does a 3D pentagon have

Which of the following is not a factor of 4x2 - 4x2y - 16x + 16xy? A. x + 4 B. x - 4 C. 4x D. 1 - y

The oil tank is leaking at a rate of 1.2 oz per mile driven. You drove 15 miles over to your grandmas house. how many cups of oil did your car leak

How many real numbers solutions are there in the equation? 0=-3x^2+x-4?

Cual es la diferencia 4/7 y 1/3