Answer:
Out of your 4 options, it's -4.6
Step-by-step explanation:
Answer:
3*4 3*8 12-24 so it should be the first option
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First find a common denominator between 4hours and 3hours. => 12 hours
<span>In 12 hours Mona can paint 3 rooms </span>
<span>In 12 hours Lisa can paint 4 rooms </span>
<span>In total they can paint 7 rooms in 12 hours. </span>
<span>To paint 1 room, they need 1/7 of the time. </span>
<span>12 * (1/7) = 12/7 </span>
<span>so 12/7 hours</span>
Answer:

Step-by-step explanation:
Alright so being presented with this equation the first thing we want to do is subtract 1 from both sides of
.
.
Now we want to simplify it to
.
Now go ahead and divide both sides by 2. 
Make sure you simplify again to get
.
Now you need your sin/cos periodicity table. When you look at the charts. Look for the general solutions of
. After looking at the chart you will find
.
Which we can then finalize at
.
Hope this helps!