Mrs Nicholas is buying Christmas presents for her five children to give to one another. If each child gives a present to each of the others, how many presents must she buy?

How many solutions does 2x+4y=8 have

How can i improve my math skill? especially when it comes to lot of numbers like millions trillions n etc. i am 16 anda science stream student of a school in Malaysia.

consider the expression - 2 + 5a + B + 2a - 5b which term can be combined with 5a because they are like terms

The x - intercept of the line whose equation is 2 x - 3 y = 6 is 3 6 -2

12/30 equals to what percent?

a sample of 49 observations is taken from a normal population with a standard deviation of 10. the sample mean is 55. Determine the 99% confidence interval for the population mean.

Which of the following are properties of right triangles? 1. The square of the hypotenuse is equal to the sum of the squares of the other two sides 2.

21717 in expanded form

Which of the following statements describes circumscribing? Choose all correct answers. A) One figure is drawn around the other. B) One figure must be a circle. C) The figure on the inside circumscribes the figure on the outside.

Inverse operation for 20n=300