yes Mike is correct because 1/10 is also be used as a decimal which could be switched into a fraction
Evaluate
x⋅y, then set it equal to x+y.
X = y / y-1
Answer:
c=18
Step-by-step explanation:
54 divided by 9 is 6
6 times 3 is 18
Apples cost $3.60 for 3 pounds . The rate can be calculated as follows
The amount of pounds you can buy for $8.40 can be computed below
Answer:
0.2036
Step-by-step explanation:
u = arcsin(0.391) ≈ 23.016737°
tan(u/2) = tan(11.508368°)
tan(u/2) ≈ 0.2036
__
You can also use the trig identity ...
tan(α/2) = sin(α)/(1+cos(α))
and you can find cos(u) as cos(arcsin(0.391)) ≈ 0.920391
or using the trig identity ...
cos(α) = √(1 -sin²(α)) = √(1 -.152881) = √.847119
Then ...
tan(u/2) = 0.391/(1 +√0.847119)
tan(u/2) ≈ 0.2036
__
<em>Comment on the solution</em>
These problems are probably intended to have you think about and use the trig half-angle and double-angle formulas. Since you need a calculator anyway for the roots and the division, it makes a certain amount of sense to use it for inverse trig functions. Finding the angle and the appropriate function of it is a lot easier than messing with trig identities, IMO.
