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a running track in the shape of an oval is shown. the ends of the track form semicircles.

a running track is shown. the left and right edges of the track are identical curves. the top and bottom edges of the track are straight lines. the track has width 56 m and length of one straight edge 130 m.
(see attachment)

what is the perimeter of the inside of the track?

a: 260.00 m
b: 347.92 m
c: 372.00 m
d: 435.84 m

The two ends of the track are semi circles, so we need to calculate the circumference:

Circumference = PI x 56 = 175.84

The two straight  parts are 130 m each:

Total perimeter = 175.84 + 130 + 130 = 435.84 m

The answer is D.

a) one student is chosen from classroom a, then a student is chosen from classroom b.  

step-by-step explanation:

independent events are ones in which the probability of one event does not affect the probability of the second event.

one student is chosen from classroom a; this does not affect the chances of choosing a student from classroom b.   this makes these independent events.

when one card is chosen from a standard deck and then set aside before a second card is chosen, the probability of the second card being chosen changes.   this makes them dependent events.

when one student is chosen from classroom a and then a second student is chosen from classroom a, the probability of choosing the second student changes.   this makes them dependent events.

when a letter is chosen from the alphabet and then a second letter is chosen, the probability of choosing the second letter changes.   this makes them dependent events.

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

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