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WAEC Mathematics 2019 Objective — Question 45

Question 45 of 145 from the West African Examinations Council (WAEC) Mathematics 2019 Objective paper, with the correct answer and a full explanation.

45. The fourth term of an Arithmetic Progression (A.P.) is 37 and the first term is -20. Find the common difference.

A. 63
B. 57
C. 19Correct
D. 17

Explanation

u₄ = a+3d ⇒ 37 = −20+3d ⇒ 3d=57 ⇒ d=19.

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