I have like 8 problems (out of I think 70) I don't get. Some explanations would be lovely! If you could help with any I would appreciate that so much!

1.) Solve 5x^2+3x-4=0 by completing the square

2.)

Find the number of complex roots of . Then find the roots and graph the related function.
3.) Find the inner product and tell whether the vectors are perpendicular.

,

4.) If

*q *is between

and

find

.

5.) Find the value of tanArccos.

6.) Find the area of a sector with a central angle of

and a radius of 18.8 m. Round to the nearest tenth.

7.) For a circle of radius 9 feet, find the arc length

*s* subtended by a central angle of

8.) Use the rational-root theorem to find the roots of

.

I really need help with this. I feel like this guy --->

right about now.