catmg

Hi Guest!

In one hour, R, S, and T can do 1/4 of the job. 

In one hour, S and T can do 1/5 of the job. 

So R in one hour can do 1/20 of the job (1/4 - 1/5)

So if in one hour, R can do 1/20, then she needs 20 hours to do the whole job. 

I hope this helped. :)))

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For these problems, I'd highly recomend graphing them out. Personally, I love using desmos.

 https://www.desmos.com/calculator/npy869vaxj  Here's the link of the plotted triangle. 

The base is 5, and the height is 2. 

So the area is 5*2/2 = 5. 

I hope this helped. :)))

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Hi Guest!

number of girls = g

number of boys = 40 - g

5g = 4(40 - g) + 65

Try solving for the number of girls yourself.  :)))

Here's the answer if you still needed it: 

5g = 160 - 4g + 65

9g = 225

g = 25

So the number of girls is 25, meaning the number of boys is 15 (40-25)

Our final answer is 10 (25-15)

I hope this helped. :))

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Hi Guest,

The formula is Base*Height/3. 

Let's have the base be EHA, which the area is 5*6/2 = 15. 

That would make the height EF, which is 4. 

15*4/3 = 20.

I hope this helped. :)))

=^._.^=

Hi Guest!

one is 1

two thirds is 2/3

So if we want a mixed number, we can just combine them, 1 2/3. 

https://www.splashlearn.com/math-vocabulary/algebra/mixed-number

This is a link of mixed numbers. 

Keep practicing math, and you'll improve :))

=^._.^=

I'm completly stumped. 

Perhaps one of the smarter people on the forum can help answer?

If you manage to figure it out, please tell me.

Sorry

=^._.^=

Hi Guest!

I have yet to learn about ellipses, so I'm sorry I can't help you on problems 2a or 2b.

However, I'm going to try question 1. 

The quadratic equation is (-b+-sqrt(b^2-4ac))/2a, where the +- is the plus/minus weird symbol. 

For the roots to be integers, sqrt(b^2-4ac) must be an integer. 

b = -8

c = 3

sqrt(64-12a) = integer 

2sqrt(16-3a) = integer

Can you try solving for them?

=^._.^=

Hi Guest!

Try to perhaps screenshot problems in the future so it's easier to read. 

If LM is 15, then the circufremce of the circle is 30pi. 

60 degrees is 1/6 of the cricle, so the answer is 30pi/6 = 5pi. 

5pi is about 15.71

I hope this helped. :)))

=^._.^=

Hello QuestionMachine,

Thank you for asking the question. :))

But try not to repost stuff. 

https://web2.0calc.com/questions/help_69963

Especially if they are still on the front page and have been answered. 

If they are answered incorrectly, just leave a note and hopefully someone will correct it. 

Reposting will sometimes cause people to waste time answering questions that have already been answered in another post. 

=^._.^=