Find the nth term Un of the A.P., 11, 4, -3,....... .
...Find the nth term Un of the A.P., 11, 4, -3,....... .
Un=19+7n
Un=19-7n
Un=18+7n
Un= 18-7n
Un= 17-7n
Correct answer is D
A.P 11, 4, -3
1st term = 11
A.P = a, a + d, a + 2d ...... a + (n - 1)d
If a = 11
a + d = 4
d = 4 - 11 = -7
nth term = a + (n-1)d
= 11 + (n-1)(-7)
= 11 - 7n + 7
= 18 - 7n
If \(T = 2\pi \sqrt{\frac{l}{g}}\), make g the subject of the formula ...
In the diagram above, |PQ| = |QR|, |PS| = |RS|, ∠PSR = 30o and ∠PQR = 80o. Find ∠SPQ....
A boy walks 800m in 20 minutes. Calculate his average speed in km per hour ...
For what value of x is the expression \(\frac{x^2 + 15x + 50}{x - 5}\) not defined ?...
In the diagram, O is the center of the circle and the reflex angle ROS is 264o. Find ∠RTS...
If the gradient of the curve y = 2kx2 + x + 1 at x = 1 is 9, find k. ...