Justin rode the first 30 miles of a bicycle trip at a constant rate. For the next 21 miles, he reduced his speed by 3 mph (stayed constant for the 21 miles). The total time for the trip was 6.5 hours. Find Justin's rate for each part of the trip.
Justin's rate of travel was
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mph for the first 30 miles and
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mph for the last 21 miles.

Solve the equation 3x2 + 19x + 9 = 0 to the nearest tenth.

Jeffery conducted a survey in his school and found that 30 of the 50 eighth grade students' favorite subject is mathematics. based on the results, jeffery concluded that out of the 200 students in his school, 120 students' favorite subject is mathematics. select the statement that is true about jeffery's conclusion. a. jeffery's conclusion is not valid because the sample was biased since only 200 students were surveyed. b. jeffery's conclusion is valid because the sample was random since all of the students were eighth grade students. c. jeffery's conclusion is valid because the sample was random. d. jeffery's conclusion is not valid because the sample was biased since all of the students were eighth grade students.

In the diagram below? p is circumscribed about quadrilateral abcd. what is the value of x