Mathematics 2015 Waec Past Questions and Answers

Question 1 :

• WAEC 2015

If {X: 2 d- x d- 19; X integer} and 7 + x = 4 (mod 9), find the highest value of x

A. 2
B. 5
C. 15
D. 18

Question 2 :

• WAEC 2015

If {X: 2 d- x d- 19; X integer} and 7 + x = 4 (mod 9), find the highest value of x

A. 2
B. 5
C. 15
D. 18

Question 3 :

• WAEC 2015

The sum 11011₂, 1111₂ and 10_m10_n0₂. Find the value of m and n.

A. M = 0, n = 0
B. M = 1, n = 0
C. M = 0, n = 1
D. M = 1, n = 1

Question 4 :

• WAEC 2015

A trader bought an engine for $15,000.00 outside Nigeria. If the exchange rate is $0.075 to N1.00, how much did the engine cost in Naira?

A. N250,000.00
B. N200,000.00
C. N150,000.00
D. N100,000.00

Question 5 :

• WAEC 2015

If \(\frac{27^x \times 3^{1 - x}}{9^{2x}} = 1\), find the value of x.

A. 1
B. \(\frac{1}{2}\)
C. -\(\frac{1}{2}\)
D. -1