43
If x = {n\(^2\)+1:n is a positive integer and 1 \(\leq\) n \(\leq\) 5},
Y = {5n:n is a positive integer and 1 \(\leq\) n \(\leq\) 5}, find x \(\cap\) y.
- A. {5,10}
- B. {5, 10, 15}
- C. {2, 5, 10}
- D. {5, 10, 15, 20}
44
Simplify \(\frac{5+\sqrt{7}}{3+\sqrt{7}}\)
- A. 17-√7
- B. 4-√7
- C. 15+√7
- D. 7-√7
45
If log\(_{10}\)2 = 0.3010 and log\(_{10}\)7 = 0.8451, evaluate log\(_{10}\)280
- A. 3.4471
- B. 2.4471
- C. 1.4471
- D. 1.4071
46
A student spent 1/5 of his allowance on books, 1/2 of remainder on food and kept the rest for contingencies. What fraction was kept?
- A. 7/15
- B. 8/15
- C. 2/5
- D. 4/5
47
A man bought a second-hand photocopying machine for N34,000. He serviced it at a cost of N2,000 and then sold it at a profit of 15%. What was the selling price?
- A. N37,550
- B. N40,400
- C. N41,400
- D. N42,400
48
Evaluate \(\frac{81.81+99.44}{20.09+36.16}\) correct to 3 significant figures.
- A. 6.24
- B. 3.22
- C. 2.78
- D. 2.13
49
Simplify \(7\frac{1}{12}-4\frac{3}{4}+2\frac{1}{2}\)
- A. 4
- B. 41/6
- C. 45/6
- D. 51/6
50