What value should come in place of the question mark (?) in the following question?

52x14+145018=1998÷?

What smallest number should be added to 2401 so that the sum is completely divisible by 14 ?

What is the altitude of an equilateral triangle whose side is 12 cm?

If a + a2 + a3 – 1 = 0, then what is the value ofa3 + (1/a)?

If x + (1/x) = (√3 + 1)/2, then what is the value of x4 + (1/x4)?

What is the value of √121 + √12321 + √1234321 + √123454321?

A, B and C invest to start a restaurant. The total investment was Rs 3 lakhs. B invested Rs 50,000 more than A and C invested Rs 25,000 less than B. If the profit at the end of the year was Rs 14,400 then what is C's share of the profit (in Rs)?

In the given figure, CD and AB are diameters of circle and AB and CD are perpendicular to each other. LQ and SR are perpendiculars to AB abd CD respectively. Radius of circle is 5 cm, PB : PA = 2 : 3 and CN: ND = 2 : 3. What is the length (in cm) of SM ?

α and β are the roots of the quadratic equation x2 – x – 1 = 0. What is the value of α8 + β8?