Of the members who do the hurdles, 4/5 also do the long jump. how many do both hurdles and long jump?

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

Write the equation in logarithmic form e^x=403.429