Question 5: (3 points) Use like bases to solve the exponential equation. (1 ) 3n . 8 =211 Enter the exact answer. Question 6: (8 points) Use logarithms to solve. e21 - ez - 90 = 0 Enter the exact answer (i.e. keep your answer in exponential or logarithmic form, you do not need to calculate its numeric value). Enclose arguments of fun between terms. For example, c * In (h) Hints . Remember by the rule of exponents, that e2 I = (e) so that you can try to factor this as (e + something) (e + something else) where the "something" and "something else" can be positive or negative numbers. . Alternately, you could let y = e and this equation would be y2 - y - 90 = 0 and you can solve first for y and then for z. Show your work and explain, in your own words, how you arrived at your answer. Question 7: (4 points) Solve for the indicated value, and graph the situation showing the solution point. The formula for measuring sound intensity in decibels D is defined by the equation D - 10log ( - using the common (base 10) logarithm where I is the intensity of the sound in watts per square meter and I - 1012 is the lowest level of sound that the average person can hear. How many decibels are emitted from a jet plane with a sound intensity of 8.6 . 10% watts per square meter? Round your answer to three decimal places. The jet plane emits _ decibels at 8.6 - 102 watts per square meter. Select the correct graph of the situation showing the solution point. 200 1D 150- 100- (a) 50