Melody

Thanks Jugoslav, I get exactly the same answer (although I would have left it as an irrational number)

Here is my pic - drawn to scale

use the formula

A = 0.5ab*sinC   to find the area of triangle PQR

On your final what?

Are you asking us to do your exam question for you?

Start with a sketch of the function.

Then find x   if   f(x)=5

Get back to me with your answer.

Hint:

\(x^2+y^2+2xy=(x+y)^2\\ and\\ x+y=8-xy\)

After I continued on a little further I found it easier to substitute z=xy and solve for z

then I solved for x and y after that.

Here is a similar question:

Use k in all your answers

What is the common ratio of the first one  ?

What is the common ratio of the second one  ?

You want a single number for the sum of these.

What is an expression for a_3?

What is an expression for b_3?

Now what?

Answer these then see if you can continue.   [ It will be useful to remember that x^2-y^2 = (x-y)(x+y)  ]

These questions are not worded properly.   

I mean this question and at least one other similar question that you have posted.

If you want to do fractions on a calculator there are many better calculators to use. 

This calc is good for many things but fractions is not one of those things.

The question does not make sense to me.

The probabilities are based on the sample of 201 people. 

0.784*201 = 157.584

How can you have 0.584 of a person?

I think that presentation is confusing too!

Try expanding this    \((x+7)^2\)  and you will get     \(x^2+17x+49 \)

Do it to make sure you know how and to check I did it right.

so I have    \(x^2+14x+49=(x+7)^2\)

Notice if I half the 14 I get 7

If I square the 7 I git 49

so

\(x^2+14x+(\frac{14}{2})^2=(x+\frac{14}{2})^2\)

\(​​​​\)

If there is no number in front of the x^2 except for an invisible 1 then this will always be true.

Consider your example:

\(x^2 - 7x + c = (x + a)^2\)

c will be  half of -7

a will be (half of -7) squared.

So you complete this bit for me please.