math

quadratics factoring

100

Use the formula h(t)=60t-16t^2 where h(t) is the height of an object in feet, and t is the time in seconds. ignoring the staring height, how long after the arrow is released does it hit the ground?

3.75 seconds

200

Use the formula h(t)=30t-16t^2 where h(t) is the height of a flare launched from a boat, in feet, and t is the time in seconds. ignoring the starting height of the boat, at what time does the fare reach the water?

1.875 seconds 

complete the square

100

solve: 3x^2+27=0

3i

200

solve: x^2+6x-16=0

2, -8

quadratics formula

100

x^2-10+9=0

1,9

200

X^2+18x+68=0

-9 +/- sqr 13

dividing complex numbers

100

5/-6i

5i/6

200

1/2i

-i/2

multiplying complex numbers

100

5i x 8i

40

200

sqr -2 x sqr 7

- sqr 14