∠M=90°-23.1°=66.9° - it's a right answer.
u=d/sin∠D=97.25
m=cos∠D*u=89.52
Answer:
5) 64
3) a loaf of bread
6) 2
4) see saw
Step-by-step explanation:
Concave up is U-shaped.
There will be a inflection/critical point f'(x) =0 then a negative slope f'(x) = neg then another inflection/critical point f'(x) =0 at the bottom of the U-shape then a positive slope to last inflection/critical point. The interval for the Concave Up shape is the first and last inflection points.
Using the Sine Rule:-
20 /sin 45 = BC / sin 30
BC = 20 sin 30 / sin45
= 20 * 1/2 / 1 / sqrt2
= 20 * 1/2 * sqrt2
= 10 sqrt2 answer
