Core Mathematics

1Find the variance of 6, 6, 10, 10.

2Five pens and two books cost GH¢41; one pen and one book cost GH¢13. What does a book cost?

3Vertically opposite angles are

4Find the sum of the first 17 terms of the AP 7, 5, 3, …

5If y = kx and y = 48 when x = 8, the constant k = ___.

6Two circles of radii 5 cm and 3 cm have centres 10 cm apart. The length of the direct common tangent is

7Find the image of (4, 3) after a reflection in the line y = −x.

8A bag has 4 red and 6 blue balls. Two are drawn without replacement. P(both red) is

9Which set contains the whole numbers but not the negative integers?

10Find the sum of the roots of x² − 2x − 8 = 0.