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

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

A 3 Â Â
B 57 Â
C Â 19 Â Â
D 17

waec 2019 mathematics

The correct answer is C. Â 19 Â Â

a + 3d = 37

-20 + 3d = 37

3d = 37 + 20 = 57

d = \(\frac{57}{3}\)

= 19

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