"Perimeter" is the distance all the way around the drawing. If the drawing has sides, then the perimeter is the SUM of the lengths of all the sides. It's exactly the distance an ant would have to walk along the line, to get all the way around to where he started from.
To get the perimeter of the triangle, you have to add up the lengths of the three sides.
(2a - 3) + (2a) + (3a + 1) =
2a - 3 + 2a + 3a + 1 .
Add up all the 'a's: 2a + 2a + 3a = 7a
Add up all the just plain numbers: -3 + 1 = -2
Write them together, as a binomial: 7a - 2
THAT's your expression for the perimeter.
23/6
23 divided by 6 is 3 remainder 5 so it is 3 5/6
Hope this helps :)
Answer:
-4n+1
Step-by-step explanation:
hopfully this is what you were looking for
Answer:
-5
Step-by-step explanation:
f(-1) = -1^2 - 4
f(-1) = -1 - 4
f(-1) = -5
<h3>Weight of train A is 465 tons and weight of train B is 73 tons</h3>
<em><u>Solution:</u></em>
Let "a" be the weight of train A
Let "b" be the weight of train B
<em><u>Train A and Train B, weigh a total of 538 tons</u></em>
Therefore,
a + b = 538 -------- eqn 1
Train A is heavier than Train B
<em><u>The difference of their weights is 392 tons</u></em>
Therefore,
a - b = 392 ------- eqn 2
Solve eqn 1 and eqn 2
Add eqn 1 and eqn 2
a + b = 538
a - b = 392
( + ) -----------
2a = 930
a = 465
<em><u>Substitute a = 465 in eqn 1</u></em>
465 + b = 538
b = 538 - 465
b = 73
Thus, weight of train A is 465 tons and weight of train B is 73 tons
