A fence 2.4 m tall, is 10 m away from a tree of height 16 m. Calculate the angle of elevation from the top of the tree from the top of the fence.

Find the least value of x which satisfies the equation $4x ≡ 7 (mod 9)$

Find the inter-quartile range of 1, 3, 4, 5, 8, 9, 10, 11, 12, 14, 16

An amount of ₦550,000.00 was realised when a principal, x was saved at 2% interest rate for 5 years. Find the value of x