Arren practiced piano 555 days this week. He practiced \dfrac34 4
3
​
start fraction, 3, divided by, 4, end fraction of an hour each day.
How many hours did Darren practice piano this week?
hours

Out of 50 students surveyed, 16 have a dog. based on these results, predict how many of the 280 students in the school have a dog.

Astudent draws two parabolas on graph paper. both parabolas cross the x-axis at (–4, 0) and (6, 0). the y-intercept of the first parabola 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? write your answer as a decimal rounded to the nearest tenth

Afair die is cast four times. calculate the probability of obtaining exactly two 6's round to the nearest tenth of a percent