2 years ago

Q1: 1+2-3+4-5+6-…-99+100

Mathematics

1 answer:

GREYUIT [131]2 years ago

6 0

Answer:

Q1. 5050 Q2. 20100

Step-by-step explanation:

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I NEED HELP PLEASE, THANKS! :)

Elena L [17]

Answer:

First option is the right choice.

Step-by-step explanation:

$\frac{1}{\cos \left(x\right)+1}+\frac{1}{\cos \left(x\right)-1}\\\\\frac{\cos \left(x\right)-1}{\left(\cos \left(x\right)+1\right)\left(\cos \left(x\right)-1\right)}+\frac{\cos \left(x\right)+1}{\left(\cos \left(x\right)+1\right)\left(\cos \left(x\right)-1\right)}\\\\=\frac{\cos \left(x\right)-1+\cos \left(x\right)+1}{\left(\cos \left(x\right)+1\right)\left(\cos \left(x\right)-1\right)}\\\\=\frac{2cos\left(x\right)}{cos^2\left(x\right)-1}\\\\=\frac{2cos\left(x\right)}{sin^2\left(x\right)}$

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3 years ago

Liz has a 24 inch long ribbon she cuts nine 2 inch pieces from her original ribbon how much of the original ribbon is left?

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If she cut off nine pieces of 2-inch ribbon, in all, that would be 18. After that, it would simply be the matter of subtracting 24 and 18.

24 - 18 = 6.

And there's your answer. Liz has 6 inches of ribbon left.

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