Answer:
150° and 210°
Step-by-step explanation:
1) according to the condition the required cosine is <0, it means the required angles are in the II-d and III-d quaters (see the attached picture no. 1);
2) it is known, that arccos(√3/2)=30°- the angle is between 0° and 90°, - but the requred angles are between 90° and 270° (see the picture no. 2), then
3) (angle)₁=180°-arccos(√3/2) and (angle)₂=180°+arccos(√3/2), then finally
(angle)₁=180°-30°=150°; (angle)₂=180°+30°=210°.
PS. note, the suggested way is not the only one.
Answer:
25 . 71 mph
Step-by-step explanation:
45 miles in 1.75 hr
45 miles / 1.75 hr = 25.71 mph
So if she fill up 5/8 in 1/4 hours we get this equation :
1/4x = 5/8
divide everything with 1/4
x=5/2
Answer:
3.496
Step-by-step explanation:
Multiply these two by getting rid of the decimal:
38 -<em>decimal is moved one place here.</em>
<u>x092</u> -<em>decimal is moved two places here.</em>
3496 -move decimal three places over.
Answer:
1 1/5
Step-by-step explanation: