I need help on these questions asap.

23%; £80; 300; 4

Step-by-step explanation:

19. First, we'll work out what Rob earned on the telescope. That's (£). Next we'll use the formula for profit %, profit over cost price, so that would be

Which is 23%.

20. Let the original price be £. Then we have

(£)

21. a) Let the original population be people. Then we have

(people)

b) We'll assume that there are years before that happens. We know that the population grows by 60 each year, so

(years)

step-by-step explanation:

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solution:

we have to construct

∠m nt ≅ ∠p qr

the steps to draw this construction are

step 1: use a compass to draw an arc from point q which intersects the side pq at point a and the side qr at point b.

step 2: draw a segment nt and use the same width of the compass to draw an arc from point n which intersects the segment nt at a point x.

step 3:

step 4: join points n and y using a straightedge.

step 3:

option (d).maintaining the same width of the compass as ab, draw an arc from point x such that it intersects the arc drawn from n in a point y.

to draw   congruent angles , 1. width of compasses while drawing two angles should be same i.e from point at which angle has to be drawn, 2.the distance between the two points where the compass intersects the two sides should be same while drawing any two congruent angles.