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4 years ago

8

PLSSS ANSWER!!!!!!!!!!!!

1 answer:

Brums [2.3K]4 years ago

5 0

Look at the picture.

The formula of an area of a triangle:

$A_\Delta=\dfrac{1}{2}ab\sin\alpha$

In the equilateral triangle, the measures of all angles are the same and equal to 60°.

Therefore your answer is:

$\dfrac{1}{2}aa\sin(60^o)=\dfrac{1}{2}a^2\sin(60^o)$

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What number equals to the 3/5 part of 1,8?

anastassius [24]

1.8 = 18/10
Then the number that’s equal to the 3/5 part of 1.8 is :
(18/10) multiplied by (3/5)
(18/10)(3/5) = 54/50 = 108/100 = 1.08
Then our number is 1.08

6 0

3 years ago

What is 2/5 ÷ 6/8 please

Alchen [17]

The First Answer is 0.4 and the second answer is 0.75.

6 0

3 years ago

Read 2 more answers

Find the value of cos θ if the angle θ is in the third quadrant and sinθ= -0.8

Rudiy27

Correct option is D) -0.6.

<u>Step-by-step explanation:</u>

We have $sin\alpha = -0.8$ . Also, we know that $cos\alpha = \sqrt{1- (sin\alpha } )^{2}$ . Let's find out value of $cos\alpha$ using above formula:

$cos\alpha = \sqrt{1- (sin\alpha } )^{2}$

⇒ $cos\alpha = \sqrt{1- (sin\alpha } )^{2}$

⇒ $cos\alpha = \sqrt{1- (-0.8 } )^{2}$

⇒ $cos\alpha = \sqrt{1- (0.64 } )^{}$

⇒ $cos\alpha = \sqrt{0.36}$

⇒ $cos\alpha = 0.6$

But we know that cos $\alpha$ is negative in third quadrant , Therefore $cos\alpha = -0.6$ .

Hence, correct option is D) -0.6.

3 0

3 years ago

Which statement describes the mapping?

icang [17]

Answer:

Third one

Step-by-step explanation:

To be a function x must only have 1 y value or you're really describing a limit which isn't part of the outputs

However, In your case two x values equaling the same y value is fine because the x values do not have two y values

This is a function, as each x value corresponds to one y value

My apologies I was confused with my first answer.

5 0

3 years ago

John Matthew has $50 in his savings. Each week he spends $4 on snacks during lunch. Write the equation for this. y=mx+8

goldfiish [28.3K]

Matthew has $50 in his saving, and his saving = y, y = 50

He spends $4 (the m) on snacks each time

50 = 4x + 8

Isolate the x. Note the equal sign, what you do to one side, you do to the other. Do the opposite of PEMDAS.

First, subtract 8 from both sides

50 (-8) = 4x + 8 (-8)

42 = 4x

Divide 4 from both sides

(42)/4 = (4x)/4

x = (42)/4

x = 10.5

John Matthew buys 10 snacks (since he cannot buy 1/2 a snack)

~

8 0

3 years ago