6.91, 7, 7 1/8, 15/2 OR 7 1/2
6.91 would be the least due to the whole number (6) being already less than 7. Next is 7 because of it being by itself with no fraction added. Next is 7 1/8 and 15/2. 15/2 is greater than 7 1/8 because when simplified you get 7 1/2 which can become 7 4/8, therefore greater than 7 1/8.
True, for a contrapositive you switch the parts and then make them opposite, but the statement is still true.
Translating this word problem into an algebraic equation, we get:
3x - 2/5 = 8/5.
Let's combine the constants: adding 2/5 to both sides of this equation yields
3x = 10/5, or 3x = 2.
Solving for x: x = 2/3
The x in the formula is the depth.
You are given two different depths, replace x with the depths, solve for T, then subtract the to find the difference:
At 1200 meters the temperature is:
T = 4500/1200 = 3.75 degrees
At 3750 meters the temperature is:
T = 4500 / 3750 = 1.20 degrees.
The difference in temperature between the two depths is:
3.75 - 1.20 = 2.55 degrees C.
Parents granted you some dollars and asked you to spend at least 30 dollars on a trip to the local park. You know that the base fare for renting a car to the park is 10 dollars plus three dollars per each person.
What is the minimal number of friends that you should take to spend all the money you won?