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I like to look it as how many  people-minutes/job      (people minutes per job)

( 4 people   x   150 minutes )  /  (1/2 job)  =  1200  people-minutes/job

for the second job:    ( 10 people x  ?minutes)/ (1/3job)  = 1200 people-minutes/job

                                                then   ?  = 40 minutes

i accidentally paste the same photo it was a percent question: "I can t understood your percents :/"

write 9:50 as a percent

If that is a ratio, then we have:

9/50 X 100=18%

6a squared - 7ab

=36a^2 - 7ab

Simplify the following:
2/5 y-9/10 y-4+7

Put each term in 2/5 y-9/10 y-4+7 over the common denominator 10: 2/5 y-9/10 y-4+7  =  (4 y)/10-(9 y)/10-40/10+70/10:
(4 y)/10-(9 y)/10-40/10+70/10

(4 y)/10-(9 y)/10-40/10+70/10 = (4 y-9 y-40+70)/10:
(4 y-9 y-40+70)/10

Grouping like terms, 4 y-9 y-40+70 = (70-40)+(4 y-9 y):
((70-40)+(4 y-9 y))/10

4 y-9 y = -5 y:
(-5 y+(-40+70))/10

70-40 = 30:
(30-5 y)/10

Factor 5 out of 30-5 y:
5 (6-y)/10

5/10 = 5/(5×2) = 1/2:
Answer: | (6-y)/2

Use a decimal to find 74% of 22.

74/100 X 22=.74 X 22=16.28

Convert decimal to binary

Best way to understand it is to use an example. PAY GOOD ATTENTION:

Convert 123 into binary.

We begin by 123 by 2

123/2=61.5 if the division leaves a fraction then, that is a (1.) We drop the fraction and continue to divide by 2, so next we have,

61/2=30.5 again it leaves a fraction, and we have another (1.) We contiue the same,

30/2=15 This time it divides evenly with bo fraction, and that is a( 0) in binary. We continue:

15/2=7.5 It leaves a fraction and that is a (1)

7/2=3.5 same thing here and that is a (1)

3/2=1.5 same thing here and that is a (1)

And the last 1 left comes down as a (1)

So now, we put them ALL in order from the bottom to the top, beginning from the left-hand side as follows: 1111011. That is the binary equivalent of 123 in decimal form.

Very bored . LOL

9/50 is the same as 18/100. When you divide 9 by 50 (or 18 by 100) you get .18, or 18%.

Well, we double the digits so that we now have 4+4=c

We add the two digits, and we have the result of 8

c=8

8-4=4

4 is the answer...

each of four quarters of a circle.

each of four parts of a plane, sphere, space, or body divided by two lines or planes at right angles.

an instrument used for taking angular measurements of altitude in astronomy and navigation

you can try one of these if it helps😊

Very easy ... 2+2=4

Hi DS    

n the plan it is 4cm by 2cm

but  1cm represents 5m

so

4cm represents 4*5=20metres

2 cm represents 2*5=10metres

so the actual dimensions are 20 metres by 10 metres.

Thanks rarinstraw 

That's an excellent answer :)

Yours is a very good answer too guest :)

Yes, that is correct Hayley but what are the units and what is the full answer ?

There is no reason to think that this is intended as a diophantine equation, nothing about integer nly solutions is mentioned. :)

Hayley, you have rearranged the equation correctly which is really good but wouldn't it be mor normal to change it to y=.....   ?

What's 6x+3y=-12

This is the equation of a line.

This is what the graph looks like

Hi DS it is great to see you on the forum :))

Some researchers wanted to know how many salmon were in a local river. The researchers marked 520 salmon with tags. Later, they captured 1,200 salmon and found that 52 of them had tags. To the nearest whole number, what is the best estimate for the salmon population?

That is a good question :/

520 in total have tags.

and   52/1200 have tags

\(\frac{52*10}{1200*10}=\frac{520}{12000}\)

so I would think that about 520 out of 12000 have tags.

The population is about 12000      

Sorry Hayley but that is not correct

-2(4)^x    = -2*4^x

it cannot be simplified further although it can be rewritten like this:

\(-2*4^x=-2*(2^2)^x=-2^1*2^{2x}=-2^{(2x+1)}\)

If you want to graph 

y=-2*4^x

here is the graph:

It is Saturday LOL - You are just behind the time.

Of course you are welcome here Hayley, you are the life of the party.

OR  perhaps more correctly, you are the heart of the party.  

Yea, that REALLY is funny   

Hayley, that is a really good answer but you made it a little more difficult than necessary.

You did not need to break it up.

-3 < x + 3 < 9

just add 3 to all three 'sides'

-3-3 < x + 3 -3< 9-3

-6<x<6

Not quite Hayley.

y=3(2^x)

means

y=3*(2^x)

or

\(y=3\times 2^x\)

and this cannot be simplified.

-----------------

I think that you a getting it confused with   

y=(3^x)(2^x)

\(y=(3^x)(2^x)=3^x2^x=6^x\)

Thanks omi67   

Hayley, only your first formula is accurate.  Can you see what is wrong with the others?   

Solveit,

You asked exactly the same question before.

And you were involved in the answers.

I do not understand why you asked again.

I am really puzzled by this.