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777dan777 [17]
3 years ago
12

If sinA÷2 =4÷2 find the value of cosA (not by pythagoras theorem)​

Mathematics
1 answer:
Grace [21]3 years ago
6 0

Answer:

Step-by-step explanation:

Sin A ÷ 2 = 2

Sin A = 2×2

Sin A = 4

Cos A = sqrt (1 - Sin ^2 A) = sqrt(1 - 4^2)

Cos A = sqrt(1-16) = sqrt (-15) = sqrt(15i^2)

Cos A = i sqrt(15)

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Naomi surveyed 480 of the students in her school about their favorite color. 95% said their favorite color was red. How many stu
vichka [17]

Answer:

77

Step-by-step explanation:

88e3838383883

4 0
3 years ago
Consider the function represented by the equation 6q = 3s - 9. Write the equation in function notation, where q is the independe
serg [7]

Answer:

s = 2q + 3

Step-by-step explanation:

A linear function has the form:

● y = mx + b

● y is the output of the function

● x is the variabke that we input

● b is the y-intetcept.

Focus on y and x.

Notice that y depends of the value of x. The value of y changes by changing x. So the value of x controls the output y.

y is dependent but x is not.

■■■■■■■■■■■■■■■■■■■■■■■■■■

● 6q = 3s - 9

We want q to be the independent variable wich means that q will be the input. Therefore s should be the output.

The strategy we are going to follow is separating s in one side alone.

● 6q = 3s - 9

Add 9 to both sides

● 6q + 9 = 3s -9 + 9

● 6q + 9 = 3s

Divide both sides by 3

● (6q + 9)/3 = (3s)/3

● (6q)/3 + 9/3 = s

● s = 2q + 3

So the answer is s = 2q + 3

6 0
3 years ago
Using the figure below identify 1 pair of the following angle relationships
tangare [24]

\\1) \:  \: \underline{ \sf{ Alternate \: interior \: angles \:  \:  : }}\\

\sf \implies \: 2\:  \: and \:  \: 7\\

\sf \implies \: 6\:  \: and \:  \: 3\\\\

\\2) \:  \: \underline{ \sf{ Alternate \: interior \: angles \:  \:  : }}\\\\

\sf \implies \: 1\:  \: and \:  \: 8\\

\sf \implies \: 5\:  \: and \:  \: 4\\\\

\\3) \:  \: \underline{ \sf{ Corresponding \: angles \:  \:  : }}\\

\sf \implies \: 3\:  \: and \:  \: 1\\

\sf \implies \: 5\:  \: and \:  \: 7\\

\sf \implies \: 4\:  \: and \:  \: 2\\

\sf \implies \: 6\:  \: and \:  \: 8\\\\

\\4) \:  \: \underline{ \sf{ Consecutive\: Interior \: angles \:  \:  : }}\\

\sf \implies \: 2\:  \: and \:  \: 3\\

\sf \implies \: 6\:  \: and \:  \: 7\\\\

\\5) \:  \: \underline{ \sf{ Consecutive\: Exterior \: angles \:  \:  : }}\\

\sf \implies \: 1\:  \: and \:  \: 4\\

\sf \implies \: 5\:  \: and \:  \: 8\\\\

7 0
1 year ago
Need help with middle two questions... I’ll give points
nignag [31]

Answer:

ok sorry i could not put this into a formula im have to go but i will show you a really easy way.

Step-by-step explanation:

for number 1 i got (7,-1)

This is because there is a slope of 1/1 between these two points. so i plotted the two points on the graph. The distance between the two points is 4. so i followed the slope 4 times and thats what i got.

The correct way for doing number 1 is using the distance formula i believe but im running out of time

for the second one i got  (3, -1/2)

we do this by using the midpoint formula.

The first picture is for number one and the second for number 2

if you have any questions feel free to ask in the comments

7 0
3 years ago
Lines K and N are perpendicular If the slope of line K is -6, what is the slope of Line N
djverab [1.8K]

line N has slope m = \frac{1}{6}

given a line with slope m then the slope of a line perpendicular to it is

m_{perpendicular} = - \frac{1}{m}


thus line N has slope - \frac{1}{- 6} = \frac{1}{6}


6 0
3 years ago
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