Answer:
The first one.
Step-by-step explanation:
solving for x:
5/2 = 7.5/x
cross multiply
2 ×7.5 =5x
x= 2×7.5/5
x= 3
solving for y:
values of the small triangle over the bigger triangle-
5/6 =7/y
cross multiply and solve for y
y= 8.4
therefore (x= 3; y= 8.4)
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Three values of x that would result in y = cot x being undefined are 
Given :
y=cot(x)
we need to find where cot(x) is undefined
We know that 
when the denominator is 0 then we can say cot(x) is undefined
Lets find out x values that makes sin(x) as 0
We know that sin(0)=0

x values values that makes sin(x)=0 are 
These x values makes the denominator of cot(x) as 0 and it is undefined
So , three values of x that would result in y = cot x being undefined are 
Learn more : brainly.ph/question/12155214
The probability of the door opening within three attempts is the answer. C
Answer:
In 14 weeks, they will have the same earnings.
Step-by-step explanation:
y = 55x + 1300 -------- (1)
y = 25x + 1720 -------- (2)
(2) = (1)
55x + 1300 = 25x +1720
55x - 25x = 1720 - 1300
30x = 420
30x ÷ 30 = 420 ÷ 30
x = 14