Question 14 (multiple choice worth 5 points) (08.03 lc) a system of two equations is shown below: equation c: a = 2b 7 equation d: a = 5b − 3 what value of a can be substituted into equation d to solve the system of equations? 2b 5b 5b − 3 2b 7

The decibel level of sound is 50 db greater on a busy street than in a quiet room where the intensity of sound is watt/m2. the level of sound in the quiet room is db, and the intensity of sound in the busy street is watt/m2. use the formula , where is the sound level in decibels, i is the intensity of sound, and is the smallest sound intensity that can be heard by the human ear (roughly equal to watts/m2).

Can you simplify 4/7? 24 points will be awarded!

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angle measure.