How do I solve this problem and show my work? A group of 71 friends meet for lunch. They greet each other by exchanging first bumps. How many fist bumps are exchanged if each friend must bump with each of the 70 others?

A negative correlation coefficient means that the value of the dependent variable stays the same as the value of the independent variable decreases. the value of the dependent variable decreases as the value of the independent variable decreases.

Express 86400 in scientific notation

How to factor 54a + 24b

Write the equation of the line in slope-intercept form. perpendicular to y = 2x+6 and passing through (-4,2)

Solve for d. 4d - 4 = 5d - 8

What is the historical estimate of beta for your stock? what is the range of the estimate with 67% probability? with 95% probability?

A pet store had 6 puppies selling for 104 each and 12 kittens selling for 24 each. Today only 2 puppies and 8 kittens were left. In dollar terms, what was the ratio of the sales of puppies to kittens?

Find the sum: (2x^2 + x + 13) + (3x^2 + 2x + 1)

How to find the unknown measure of a rectangle whose area is 91 and width is 7.

There was 320 girls and 180 boys what is the percentage of girls