A ladder is 13 m long. It is put against a wall so that it reaches a point on the wall
12.1 metres above the ground
th
Ladder
Wall
13 m
Trigonometry
(1) What angle does the ladder make
with the ground?
(ii) If the ladder were to reach a point
12.6 m high, what angle would the
ladder make with the ground?
(iii) The correct angle for a ladder is 75°
How high will the ladder reach up
the wall at this angle?

obtuse angle= 130 degrees

Step-by-step explanation:

13

answer: c, the green line

step-by-step explanation:

there is no black line, eliminate b.

simple interest implies periodic payments, but the red line shows no payments, eliminate d.

simple interest has equal payments. if paid say every day, the graph is about a straight line (actually a stairstep).

the yellow line is not straight, eliminate a.

check: the green line is straight, answer is c.

simple interest with positive interest rate gives a straight line sloping up to the right. green line:

g(t) = $100 + ($200-$100) ÷ (20 years) × (t years)

= $100 + (4%/year) × ($100)(t years)

incidentally, the yellow line curving upward represents continuously compounded interest

y = $100 × 2^(t years / (14 assuming the yellow line hits $200 at 14 years. 2^0 is 1, so y(0) = $100; 2^(14/14) is 2, so y(14) = $200.