Question 761:

• WAEC 2021

Find the value of the derivative of y = 3x\(^2\) (2x +1) with respect to x at the point x = 2.

A. 72
B. 84
C. 96
D. 120

Question 762:

• WAEC 2021

Find the radius of the circle 2x\(^2\) - 4x + 2y\(^2\) - 6y -2 = 0.

A. 17/4
B. 17/2
C. 17/√2
D. √17/2

Question 763:

• WAEC 2021

Given that f: x --> x\(^2\) - x + 1 is defined on the Set Q = { x : 0 ≤ x < 20, x is a multiple of 5}. find the set of range of F.

A. {21, 91, 221}
B. {21, 91, 221, 381}
C. {1,21, 91, 221}
D. {1,21, 91, 221,381}

Question 764:

• WAEC 2021

If \(\frac{15 - 2x}{(x+4)(x-3)}\) = \(\frac{R}{(x+4)}\) \(\frac{9}{7(x-3)}\), find the value of R

A. \(\frac{-32}{7}\)
B. \(\frac{-23}{7}\)
C. \(\frac{23}{7}\)
D. \(\frac{32}{7}\)

Question 765:

• WAEC 2021

The table shows the distribution of marks obtained by some students in a test

Marks	0-9	10-19	20-29	30-39	40-49
Frequency	4	12	16	6	2

What is the upper class boundary of the upper quartile class?

A. 49.5
B. 39.5
C. 29.5
D. 19.5