9514 1404 393
Answer:
- 21x -28y
- 30 minutes
Step-by-step explanation:
1. The distributive property tells you the factor outside parentheses multiplies each of the term inside parentheses.
7(3x -4y) = 7·3x -7·4y = 21x -28y
__
2. Time, speed, and distance are related by ...
time = distance/speed
time = (20 mi)/(40 mi/h) = 1/2 h = 30 minutes
The drive takes 30 minutes.
Answer:
<u>Yes. I agree with his claim because the equation relating the miles left to walk and the number of miles left to walk is :</u> 
Step-by-step explanation:
Given :
- <em>It's a 21 - mile walkathon</em>
- <em>The rate at which he is moving is 3 miles per hour.</em>
Let the number of miles walked be 
;
∴,
The number of miles '
' left to walk will be : 
<em>Thus the time '
' for which he walked :</em>
:
∴
From these equations , we get :
Thus , when we compare this with 
,
<u>Thus this is an equation of a Line with slope -3.</u>
Answer:
10.92 m
Step-by-step explanation:
To solve for the height, we first find the area of the triangle. Since the area of a triangle is 1/2 of the base times the height, we get the area to be 109.2. Dividing it by 20 and then multiplying by 2, we get 10.92 as the height.
When zero is added to or subtracted to a number, the number is not affected.
