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iren2701 [21]
2 years ago
6

What is the value of (-5)(-8) A 40 B 45 C -40 D 13

Mathematics
2 answers:
mariarad [96]2 years ago
4 0

Answer: 40

Step-by-step explanation:

Novay_Z [31]2 years ago
4 0
-5 times -8 = 40
That should be right because a negative times a negative equals a positive
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Plz help me i need help before 1/28/22
garik1379 [7]

Answer:

3/4

Step-by-step explanation:

three-fourths also means 3 out of 4. This can be shown as a fraction as 3/4

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2 years ago
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2,560 divided by 2 what is the answer
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2+2-1 that's three quick maths.


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Can someone please do this for me, It would be amazing!<br><br>sorry that's all the points I have :(
Serggg [28]

If i was you i would look up every box in the word bank then find examples of each box and do the best I could.

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3 years ago
Josh is solving the equation 2 % + 2% and predicts that his
gregori [183]
4 5/6 Hope this helps.

You have to find the common denominator for 1/3 & 4/8. & it’s 24. By doing that you have to multiply 3x8, when you do that you also have to multiply 1x 8 so you get 8/24 , same with 4/8 but with three so you get 12/24. Then add your answer 20/24, which equals out to 20/24 which reduces to 5/6. Add 5/6 to 2+2 and you’re left with 4 5/6. Hope this helps.
4 0
3 years ago
Prove the identity.
Delvig [45]

Answer:

D. Pythagorean

Step-by-step explanation:

Given the identity

cos²x - sin²x = 2 cos²x - 1.

To show that the identity is true, we need to show that the left hand side is equal to right hand side or vice versa.

Starting from the left hand side

cos²x - sin²x ... 1

According to Pythagoras theorem, we know that x²+y² = r² in a right angled triangle. Coverting this to polar form, we have:

x = rcostheta

y = rsintheta

Substituting into the Pythagoras firnuka we have

(rcostheta)²+(rsintheta)² = r²

r²cos²theta+r²sin²theta = r²

r²(cos²theta+sin²theta) = r²

(cos²theta+sin²theta) = 1

sin²theta = 1 - cos²theta

sin²x = 1-cos²x ... 2

Substituting equation 2 into 1 we have;

= cos²x-(1-cos²x)

= cos²x-1+cos²x

= 2cos²x-1 (RHS)

This shows that cos²x -sin²x = 2cos²x-1 with the aid of PYTHAGORAS THEOREM

5 0
3 years ago
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