Subtract. 405,000,000−1.7×10^8 (a) 2.35 (b) 2.35×10^7 (c) 2.35×10^8 (d) 2.35×10^9

Evaluate 4 a for a = 5 2/3 . express your answer in simplest form.

Aman is 6 feet 3 inches tall. the top of his shadow touches a fire hydrant that is 13 feet 6 inches away. what is the angle of elevation from the base of the fire hydrant to the top of the man's head?

(c) the diagram shows the first three shapes of a matchsticks arrangement.first shape = 3second shape = 5third shape = 7given m represents the number of matchstick used to arrange the n'th shape.(i) write a formula to represent the relation between m and n. express m as the subjectof the formula.(ii) 19 matchsticks are used to make the p'th shape. find the value of p.