15 (d) A boat travels from C to A at an average speed of x m/s.
A second boat travels from B to A at an average speed 1 m/s faster than the first boat.
It takes the first boat 1 minute longer to reach A than the second boat.
Write down an equation in x and show that it simplifies to x2 - 4x - 30 = 0.
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Answer the following for 896.31 cm= km 100cm = 1m 1000m = 1km a) 0.0089631 b) 0.0089631 c) 8.9631 d) 89.631

Which of the expressions (on the photo document i inserted) together represent all solutions to the following equation? 8cos(12x)+4=-4 *the answer should be in degrees.* > i would like for someone to explain the process to find the solutions for this.

Astudent must have an average on five test that is greater than it equal to 80% but less than 90% to receive a final grade of b. devon's greades on the first four test were 78% 62% 91% and 80% what range if grades on the fifth test would give him a b in the course? ( assuming the highest grade is 100%)