Answer:
The boat is 8.4m out of the sea
Step-by-step explanation:
Kindly find attached rough sketch of the problem.
From the sketch we can see that the observer from the cliff and the horizontal distance forms a right angle triangle
Let the horizontal distance be x
Let the angle of elevation from the boat be y
Applying sum of angles in a triangle
90+6+y= 180
96+y=180
y=180-96
y= 84°
Applying SOH CAH TOA
Using TOA
Tanθ= opposite /adjacent
Tan 84= 80/x
x= 80/tan 84
x= 80/9.51
x= 8.4m
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Q25 is D, Q26 is A, & Q28 is 6. Sorry, I'm not sure how to calculate Q27
Answer:
If the sinø=7/12, cosø is 
Step-by-step explanation:
We are given sinФ = 7/12
We need to find cosФ
The basic trigonometric functions of right triangle are:


We need values of adjacent and hypotenuse to find cosФ
Using Pythagoras theorem we can find the value of adjacent

We have Hypotenuse= 12 and Opposite = 7 (because
and we are given 
Inserting values and finding adjacent:

So, value of Adjacent is 
Now finding cosФ

Adjacent =
, hypotenuse = 12

So, If the sinø=7/12, cosø is 
In order to find the slope of a line, u must use the slope formula. Which is (y2-y1/x2-x1). For example if you had a set of coordinates that are (6,4) and (2,8) you would first sub the 8 from4 which gives you 4. The u do the same with 2 and 6 which gives u 4. After that you divide 4 by 4. and your answer is 1