213
212
211
210
Correct answer is B
a = 4, r = 42
84 = 2
n = 11
Tn = arn - 1
T11 = 4(2)11 - 1
4(2)10 = 212
since 4 = 22
= 212
A ladder 9m long leans against a vertical wall, making an angle of 64° with the horizontal ...
Evaluate 219 to 3 significant figures...
In the diagram, PQR is a tangent to the circle QST at Q. If |QT| = |ST| and ∠SQR = 68°, find...
Evaluate 1.25×0.0250.05, correct to 1 decimal place...
If O is the centre of the circle, < POS equls ...
In the diagram, O is the centre of the circle of radius 18cm. If < zxy = 70o, calculate the ...