Evaluate g(x)= 2/3x + 7 for x=9

a. 9
b. 25
c. 12.5
d. 13

Need ! give step by step solutions on how to solve number one \frac{9-2\sqrt{3} }{12+\sqrt{3} } number two x+4=\sqrt{13x-20} number three (domain and range) f(x)=2\sqrt[3]{x} +1

Two planes leave an airport at the same time, one flying east, the other flying west. the eastbound plane travels 20 mph slower. they are 1600 mi apart after 2 hr. find the speed of each plane.

For the right triangle shown, the lengths of two sides are given. find the third side. leave your answer in simplified, radical form.