PLEASE HELP WITH MATH AND BEST GETS BRAINLIEST. PLEASE SHOW WORK.
2 answers:
To solve this, we must multiply what's outside of the parentheses by what is inside.
For the first parenthetic set, we can see that we are multiplying the values by 2, so we do it this way:
For the second part of the expression, we don't see any value, but we understand that there is a negative 1 that we don't see, because of the minus sign between the two parenthetic sets.
So we end up with this:
So, without parentheses, the expression looks like this:
Which could be further reduced to
Hope that helped! =)
For the first parenthetic set, we can see that we are multiplying the values by 2, so we do it this way:
For the second part of the expression, we don't see any value, but we understand that there is a negative 1 that we don't see, because of the minus sign between the two parenthetic sets.
So we end up with this:
So, without parentheses, the expression looks like this:
Which could be further reduced to
Hope that helped! =)
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Answer: 20 mph
Explanation:
Speed is a physical quantity which is equal to the ratio between the distance covered (d) and the time taken (t):
In the first part of the problem, the plane flew a distance of d=400 mi in a time of t=2.5 h. The speed of the plane in this case was the difference between the proper speed of the plane, v, and the speed of the wind, w, since the plane flew opposite to the wind. So we can write:
(1)
During the return trip, the plane flew with a speed (v+w), since the wind was on the tail, and it took 2 hours to cover the same distance:
(2)
So we have two equations with two unknown variables. From (1), we get
Substituting into eq.(2)
So, the speed of the wind was 20 mph.