Do these pairs of values (x and y) represent two quantities that are proportional?
X y
3 12
5 20
6 24
9 36
A. No, because none of the pairs is a simplified ratio.
B. Yes, because all of the pairs represent the same ratio.
C. No, because the y-values are not increasing at a constant rate.
O D. Yes, because as x increases, y increases.

Wich statement could be used to explain why the function h(x)= x^3 has an inverse relation that is also a function

If x varies directly as y, and x = 7.5 when y = 10, find x when y = 4

At wind speeds above 1000 centimeters per second (cm/sec), significant sand-moving events begin to occur. wind speeds below 1000 cm/sec deposit sand and wind speeds above 1000 cm/sec move sand to new locations. the cyclic nature of wind and moving sand determines the shape and location of large dunes. at a test site, the prevailing direction of the wind did not change noticeably. however, the velocity did change. fifty-nine wind speed readings gave an average velocity of x = 1075 cm/sec. based on long-term experience, σ can be assumed to be 245 cm/sec. (a) find a 95% confidence interval for the population mean wind speed at this site. (round your answers to the nearest whole number.) lower limit cm/sec upper limit cm/sec