A pipe can fill a tank in 6 hours, while another pipe can empty it in 8 hours. If both pipes are opened together, in how much time will the tank be filled?

Find the equation of the tangent to the circle x²+y²=25 at the point (3, 4).

How many different ways can the letters of the word "APPLE" be arranged?

How many 4-digit numbers can be formed using the digits 1, 2, 3, 4, 5, 6, 7 if no digit is repeated?

Find the equation of the parabola with focus at (3,0) and directrix x= -3

The values of x ,y and z in order, if the system of equations 3x+y+2z= 3, 2x-3y-z= -3 , x+2y+z= 4, are

d/dx of integral (f(x))dx is

If 7 times the 7th term of an AP is equal to 11 times its 11th term, find18th term of the AP is

Identify the type of x-intercepts of the quadratic equation f(x) = (x + 6)² + 2

If α and β are the roots of the quadratic equation ax² + bx +c = 0, then αβ²+α² β+αβ equals:-

Find the total no. of possible orders from the 72 elements.

If the first term of a G.P be 5 and common ratio be *5 ,then which term is 3125

If the first term of a G.P. is 20 and the r = 4. Find the 5th term.

If X1 and X2 are the roots of the equation 3x²-2x-6=0 then X1²+X2² is equal to

Look at this series: 7, 10, 8, 11, 9, 12, ... What number should come next?

Look at this series: 8, 6, 9, 23, 87 , ... What number should come next?

Tanya is older than Eric.
Cliff is older than Tanya.
Eric is older than Cliff. If the first two statements are true, the third statement is

Class A has a higher enrollment than Class B.
Class C has a lower enrollment than Class B.
Class A has a lower enrollment than Class C. If the first two statements are true, the third statement is