A. a school has 700 students. if 2 out of every 5 students are high school students, how many high school students are there at the school?

b. if each highschool student spends 279.50 minutes in a school a day, how many total minutes do the high school students spend in class each day?

extension: if the average middle schooler spends 10 percent more time in class than the average highschooler, how much time do the middle schoolers spend in class a day?

280 students

78260 minutes

307.45 minutes per day

Step-by-step explanation:

A  We multiply the total number of students by the fraction that are high schoolers to determine the total number of high schoolers

700 * 2/5 = 280

There are 280 high schoolers

B The total time high schoolers spend in school is  the time 1 student spends in school times the number of students

279.5 * 280 =78260 minutes

C  The high schoolers spends 279.5 minutes in class

10% = .1

We need to add 10% to this time

279.5 * 10%

279.5 * .1 = 27.95

Add this  because they spend 10% more time

279.5 + 27.95 =307.45 minutes

constant acceleration- a

constant velocity- c

no velocity or acceleration- b

explanation:

for body moving with a constant acceleration, the rate of change of displacement changes over time. this is proven by the increasing gradient of the curve (a) against time.

a body that is moving at constant velocity covers equal distances over equal periods of time, thus the straight line with a constant gradient c.

a stationary body   covers no displacement as time elapses. thus the flat line with   zero gradient.

point a is the center of the circle that passes through points e, f, and g and the center of the circle that passes through points x, y, and z.