Standard Math Q+A Thread

[morning_sunshine]

- y= mx + b
y = equation of a line
m = gradient
b = y intercept
...........
The Y intercept  (AKA b) is 2 (where the coordinate is 0,2).. b
Gradient = (y2 - y1)/(X2-X1)

Let point 1 = 0, 2
Let point  2 = 2, 0

m = (0--2)/(2-0) = -1

THerefore, the line... y = 2 - x
...
P.S. You can check your answer and see if it fits properly on the cartesian plane

THANK YOU SO SO MUCH REALLY MEANS A LOT TO ME! And now i know where I went wrong Thank you again

[morning_sunshine]

Hey I'm back with another question

So this one really tripped me up because when I want to find 10% of something I usually times it by 0.1 and get the GST right?
So why is the answer D?

Thanks in advance

[RuiAce]

Hey I'm back with another question

So this one really tripped me up because when I want to find 10% of something I usually times it by 0.1 and get the GST right?
So why is the answer D?

Thanks in advance

Note that if the item cost represents 100% of the price it's to be sold at
and that the GST is 10% of this

Then the cost of the item WITH the GST combined is 110%.

[morning_sunshine]

Note that if the item cost represents 100% of the price it's to be sold at
and that the GST is 10% of this

Then the cost of the item WITH the GST combined is 110%.

Thank you so so! Can't believe that didn't cross my mind! Thank you

[morning_sunshine]

Man I'm on a roll today

But I have an exam tomorrow so want to ask as many questions I need help with as possble.
I don't understand how to make a the subject after i bought r2 across to the other side

Like does the root a a2 cancel out the r2 and I only root the V?

Thanks in advance

[RuiAce]

Man I'm on a roll today

But I have an exam tomorrow so want to ask as many questions I need help with as possble.
I don't understand how to make a the subject after i bought r2 across to the other side

Like does the root a a2 cancel out the r2 and I only root the V?

Thanks in advance

[morning_sunshine]

why did you then break the square root and put it on the two numbers ?

[EEEEEEP]

why did you then break the square root and put it on the two numbers ?

A square root of a fraction is the same as the square root of the things inside the fraction (Top and bottom)

[RuiAce]

[morning_sunshine]

Hey

So me being me I obviously assume the answer is 30%
So why is the answer 28%

Thanks in advance

[RuiAce]

Hey

So me being me I obviously assume the answer is 30%
So why is the answer 28%

Thanks in advance

[jakesilove]

Hey

So me being me I obviously assume the answer is 30%
So why is the answer 28%

Thanks in advance

Hey! Fair enough, this question was out to trick you from the start.

So, we have some total cost, let's call is $X. When we first get our 20% discount, we can find the total cost by multiplying $X by 80% (ie. Cutting out 20%).



Now, we want an EXTRA 10% discount. So, we have to discount the already discounted rate by another 10%: to do this, we multiple the total value by 90%



So, we have taken off 28% (1-0.72)

[morning_sunshine]

Ok
Moving on I found this question
And before I came to the forum I wanted to see if I could do it myself and after sitting here for half an hour I have had no luck

Please help

Telling me the answer is 8 but I dont know how

[stephanieazzopardi]

Ok
Moving on I found this question
And before I came to the forum I wanted to see if I could do it myself and after sitting here for half an hour I have had no luck

Please help

Telling me the answer is 8 but I dont know how

Hi there!

Ok so in order to see how many plants were actually sold in the week, we would require a cumulative frequency column, which will thus allow us to work out how on earth they got that mean.

So:
Cumulative frequency column (Number of plants purchased column x Frequency column)
8
38
3x
44
20
Total = 110 + 3x

The total of the frequency column in 42 + x

In this question, the person calculated the mean by dividing the sum of cumulative frequency column BY the sum of the frequency column
So, we would just solve for x using algebra, since we know what the mean already is.

(110 + 3x) / (42 + x) = 2.68

--> (110 + 3x) / 2.68 = (42 + x)
Times both sides by 2.68 to get rid of the fraction =
--> 110 + 3x = 2.68(42 +x)
Expand the brackets
--> 110 + 3x = 112.56 + 2.68x
Minus 110 from both sides
--> 3x = 2.56 + 2.68x
Minus -2.68x from both sides
--> 0.32x = 2.56
Solve for x
--> 0.32x / 0.32 = 2.56 / 0.32
     = 8

I hope that made sense!!

[emilybrooks99]

Hey Could someone please help me with these questions and let me know which formulas to use. Thanks!