Five times a number is 14 less than the square of that number. Find the positive solution

In the 30-60-90 triangle below side s has a length of and side r has a length

Which sum or difference identity would you use to verify that cos (180° - q) = -cos q? a.) sin (a -b) = sin a cos b – cos a sin b b.) cos (a -b) = cos a cos b – sin a sin b c.) cos (a -b) = cos a cosb + sin a sin b d.) sin (a + b) = sin a cos b + cos a sin b

When a valve is open 281 gallons of water go through it in one hour the number of gallons that would go through in 94 hours is