Question

1. If your final exam counts as 20% of your semester grade in a class, and you have an 88% going into the final, what percent must you score on your exam to get a 90% in the class?
2. Simplify
$\frac{4+x}{10} / \frac{ x^{2} -16}{8}$

3. Solve the equation
$\frac{4x}{x+3} = \frac{37}{ x^{2} -9} -3$
Thanks

Answer 1

1.?????
2.4/(5(x-4))

3.?????

Answer 2

.8 (88%)+.2x=90%
70.4%+.2x=90%

subtract 70.4% from 90% to get 19.6%
make the .2x into 2 and the 19.6 into 196
divide 196 by 2 to come up with the answer of 98%.
you will need a 98% to have a 90% for the final grade