WAEC - Mathematics (2019 - No. 42)
The fourth term of an Arithmetic Progression (A.P) is 37 and the first term is -20. Find the common difference.
3
57
19
17
解释
a + 3d = 37
-20 + 3d = 37
3d = 37 + 20 = 57
d = \(\frac{57}{3}\)
= 19
a + 3d = 37
-20 + 3d = 37
3d = 37 + 20 = 57
d = \(\frac{57}{3}\)
= 19