Answer:
Step-by-step explanation:
Total sum of degrees of a Triangle is 180 deg
Than: 8x-7 + x +7 + 2x + 15 = 180
11x + 15 = 180
x = (180-15) / 11 =15
Answer: 15
1.
{3x+9y=75
{8x+5y=67
2. elmination
{24x+72y=600
-
{24x+15y=201
57y=399
y=7
8x=67-35
x=4
Senior citizen ticket cost $4
child ticket cost $7
I’m sorry I don’t see the graph so I would not know.
Answer:
1) See figure attached
2)
a) 
And if we replace we got:

b) 
And if we replace we got:

Step-by-step explanation:
Part 1
We can see the plot in the figure attached.
Part 2
a)
For this case we have two points 
And we want to find the distance travelled between these two points and we can use the following formula from the euclidian distance between two points:

And if we replace we got:

b)
Since it takes two seconds in order to go from (6.9) to (10,15) we can use the definition of velocity:

And if we replace we got:

Answer:
60.96437 is the 5 decimal place of 60.9643790503 number