NEED HELP PLS

The price of a sofa is reduced in a sale from £1400 by
10%. On the last day it is reduced by a further 5%. What is the total percentage reduction?

The vertices of a triangle are a(7,5), b(4,2), c(9,2). what is m

(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.

Tell whether the two rates form a proportion