If y = 5cos(-6x), dx/dy is

In an arithmetic sequence whose 4th term is 14 and whose 11th term is 70, the sum of the first 12 terms of the sequence is

Divide the L.C.M. of 36, 54 and 90 by their HCF.

What is the sum of the first 40 even positive integers?

Find the sum to infinity of the following series 3 + 2 + 4 + 4/3 + 8/9 + 16/27 + ......

If un = 2, 6, 10, ..., the 12th term of the sequence is

The sum of the first 20 terms of the progression 3, 6, 12, ... is

Tunse bought a house for ₦1,250,000.00 and spent ₦350,000.00 to renovate it. He then sold the house for ₦2,000,000.00. What is the percentage gain?

As a general rule, the _______ is the best measure of central tendency because it is more precise.

A class of all possible subsets of space S is called

_________ are used when you want to visually examine the relationship between two quantitative variables.

Find the point on the Euclidean plane where the curve y = 2x² - 2x + 9 has 2 as gradient.

Statistics is a set of tools whose proper use will _______ the decision maker.

The heights in cm, of 10 children are 145, 163, 159, 162, 167, 149, 150, 160, 170, and 155. The standard deviation of the heights of the children is

A dealer increased the price of an item by 20%, and then increased the price of the same item by 30%. If x is the original price, what is the price after the two increases?

The roof of a shelter is made from a piece of corrugated iron 2.3m long inclined at 18º to the horizontal. How far from the wall does the roof stick out?

In an arithmetic sequence with 25 terms, if the first term is 60 and last term is -12 the common difference is

A chord 6.6m long is 5.6m from the centre of a circle. The radius of the circle is

A ladder 20m long rests against a vertical wall so that the foot of the ladder 9m from the wall. The height (correct to 1 decimal place above the ground at which the upper end of the ladder touches the wall is

The second and fifth terms of a geometric progression a 21 and 567 respectively. Find the first time and the common ratio of the progression.

In a class, 120 students speak English or French or both. 70 speak English and 55 speak French. How many speak English but not French?

Ann goes swimming regularly. She wants to improve her fitness, so she decides to swim 10 lengths in the first session and increase the number of lengths she swims by 2 every session. When she reaches 50 lengths in a session she will not increase the number any further. After how many sessions does Ann swim 50 lengths for the first time?

The length of a rectangle is three times its width. If the perimeter is 72 cm, the width of the rectangle is

What is sin 30${}^{}$?

List the integral values of which satisfy the inequality $-2<7-3x\le 10$.

What is the length of an arc of a circle with a radius of 5 if it subtends an angle of 60° at the center?

Rationalize $\frac{(4\sqrt{7}+\sqrt{2})\; /}{(\sqrt{2}-7)}$

Which of the following points does not lie on the line 2y + 5x -4 = 0?

Justice starts a 5km walk from P on a bearing 0230. He then walks 4km on a bearing of 1130 to Q. What is the bearing of Q from P?

The heights in cm, of 10 children are 145, 163, 159, 162, 167, 149, 150, 160, 170, and 155. The mean height of the children is

A straight line has the equation 10y = 3x + 15. Which of the following is true?

The ______ is the value you calculate when you want the arithmetic average.

The line y = 5x – 3 and y = 2x + 9 intersects at P. What are the coordinates of P?

Find the variance of the numbers k, k + 1, k + 2.

Find the principal which amounts to ₦4,400 at simple interest in 5 years at 2% per annum

Find the value of p, if the line which passes through (-1, p) and (-2p, 2) is parallel to the line 2y + 8x - 17 = 0.

A company employs 100 people, 65 of whom are men. 60 people including all the women are paid weekly. The number of the men that are paid weekly is

What is the slope of the line that is perpendicular to y - 2x = 1?

No of children: 0, 1, 2, 3, 4, 5, 6
No of families: 7, 11, 6, 7, 7, 5, 3
Find the mode and median respectively of the distribution above.

P is the point (2, 7) and Q is the point (6, 3). What is the gradient of PQ?