Answer:
Cos(a - b) = 0.959
Step-by-step explanation:
We know that:
Sin(a) = 4/5
Such that a is on the first quadrant (between 0° and 90°)
then:
Asin(sin(a)) = Asin(4/5)
a = Asin(4/5) = 53.13°
And:
Cos(b) = 2/5
Then:
Acos(Cos(b)) = Acos(2/5)
b = Acos(2/5) = 36.67°
Cos(a - b)
where:
a = 53.13° and b = 36.67°
Cos(a - b) = Cos(53.13° - 36.67°) = 0.959
B
x has to be larger than 2 so the arrow has to point to the right.
The value 2 is included, so the start has to be a closed dot.
10* 299.99=2999.9
2999.9/100=29.999
this would round up to 30, so Brittany saved $30. : )
