exam Maths Puzzle Numerical Ability

Write and equation of the line described:
Contains (4,9) and is perpendicular to the graph of y = 7x + 3/8.

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Please help me solve this word problem:

A ball is projected from the ground. Its distance in feet from the ground in t seconds is given by the equation s(t)=-16t+128t. At what times will the ball be 100 feet from the ground? I am lost with this statistic, can anyone help me with this.

In an effort to determine the most effective way to teach safety principles to a group of employees, four different