Remember that cos(0) represents the x value of a point on the unit circle. The period for the unit circle is 2π in radians which means that adding or subtracting 2π will get you back to the same point which has the same cosine.
Examples: cos(2π),cos(100π),cos(60π)
This should be pretty self explanatory. "miles per hour" is how many miles you can drive in 60 minutes. So, it would take....an hour to reach 80 miles. You're going 80 miles per hour.
Answer:
4:5
Step-by-step explanation:
Recall that 12 inches =1 foot
Therefore 4 feet = 12*4=48 inches

The ratio of 4 feet to 60 inches is 4:5
This ratio is in the reduced form, we cannot simplify further.
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</span>Start by combining like terms on both sides
-6+3=-3
Now we have:

To isolate g we need to subtract 12 from both sides -18-12= -30
Now we have

Divide both sides by -3 to isolate g, now we have:

When we divide an inequality by a negative we flip the sign so:

becomes:

Final answer:
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