In the 2008 Beijing Summer Olympics, Usain Bolt ran the 100 meter dash in 9.69 seconds. is that less than half, exactly, or more half as long as it took him to run the 200-meter dash?

more than half, by 0.5 seconds

Step-by-step explanation:

In his 200m dash in the 2008 Beijing Olympics, he ran it in 19.31 seconds. If he ran 9.68 seconds in his 100m dash, he would have ran more than half his time in his 200m dash.

If you were to calculate his 200m time subtracted by his 100m time, they are not equal, but the answer would be less than his time he ran in his 100m.

19.31 - 9.68 = 9.63

hello!

to begin with, we're given that on earth, a rock weighs 20 pounds, and while on jupiter, that same rock weighs 42 pounds. now, we're trying to find the weight of a rock that weighs 10.5 pounds on earth, on jupiter.

to solve this, first, set up a proportion, cross-multiply, and solve it algebraically.

setting up the proportion is the hardest and the most confusing part of the problem, but it's simple.

if on earth, the rock weighs 20 lbs, and on jupiter it weighs 42 lbs, our first part of our proportion is 20/42 lbs. the second part has to be equal to each other. this means that 10.5 has to be on the numerator of the fraction, and x, the value we're trying to find, has to be on the denominator. remember that the rock weighs 10.5 lbs on earth, and we're trying to find the weight of it on jupiter (which is x).

20/42 = 10.5/x

next, you would cross-multiply.

20x = 42(10.5)

20x = 441

now, solve it algebraically by using division.

x = 22.05 lbs

this can be rounded to 22.1 lbs.

therefore, the weight of the rock on jupiter is 22.1 lbs, the fourth choice.

55 degrees because 55+55=110 degrees