Evaluate `7!-5!`.

Find the value of (7!)/(5!) ?

Evaluate (5/8)^-7 xx(8/5)^-4

Evaluate: |(2,4,5),(5,7,3),(2,4,5)|

Evaluate each of the following in terms of x and y, if it is given that x = log_(2)3 and y = log_(2)5 log_(2)7.5

If the mean of the following data is 7.5, then find the value of 'A'.

If the points (7,-2) , (5,1) and (3,5) are collinear. Find the value of k.

Find the value of 49^((1-log_7(2)))+5^(-log_5(4) is

If A(-5, 7), B(-4,-5), C(-1, -6) and D(4,5) are the vertices of a quadrilateral, then, find the area of the quadrilateral ABCD.

Find and correct the errors in the following mathematical statement: (7x+5)/5 =7x.