PLEASE HELP WILL MARK BRAINLIEST!!! DUE NOW

The speed of sound = 34,300 centimeters per second. based on this value, calculate the time needed for an ultrasound poles to travel 368 centimeters.

Note: ultrasound travels at the same speed as “normal waves”

Select the correct answer. what is the exact value of sin (157.5°)? a. 'sqrt(2 - sqrt(2))/2 b. *"-"'sqrt(2 + sqrt(2))/29 c.'sqrt(2 + sqrt(2))/4" d. "-"sqrt(2 + sqrt(2))/4)

2/3(-6y+9x) expand each expression using the distributive property

Astudent draws two parabolas both parabolas cross the x axis at (-4,0) and (6,0) the y intercept of the first parabolas is (0,-12). the y intercept of the second parabola is (0,-24) what is the positive difference between the a values for the two functions that describe the parabolas