Melody

Well for starters,

x-6 = 3x+b   when  x=-3

from that you can find b

There is no 'a' in those equations ??

1*3*2=6

x1(t)=3[u(t)−u(t−1,6)] x2(t)=5[u(t)−u(t−3,5)] Find z(t)=x1(t)∗x2(t).

\(x_1(t)=3[u(t)−u(t−1.6)] \\ x_2(t)=5[u(t)−u(t−3.5)]\\ Find\quad z(t)=x_1(t)∗x_2(t).\)

I still do no understand your question but is this what it is supposed to look like?

ok.

Be careful what you post. It is important not to break copyright laws or any rules you have agreed to for your learning institution.

BOLD FACE,     UNDERLINING    AND     ITALICS

Thanks Alan,

Hi Jurimagic,

Perhaps you have not looked at what Alan has done with a fresh eye.

This is ultimately a difference of 2 squares factorization.

Incidentally, I know, and expect Alan knows, that you are always grateful for the help we give you.

That is why, if I am on and I see your question, I will always answer quickly.   

\(p^2-9s^2+6pq+9q^2\\ =p^2+6pq+9q^2-9s^2\\ =(p^2+6pq+9q^2) - (9s^2)\\ =(p+3q)(p+3q) - (9s^2)\\ =(p+3q)^2 - (9s^2)\\ \text{This is the difference of 2 squares}\\ =(p+3q\;\textcolor{red}{\textbf{-}}\;3s)(p+3q\;\textcolor{red}{\textbf{+}}3s)\)

LaTex Coding:

p^2-9s^2+6pq+9q^2\\
=p^2+6pq+9q^2-9s^2\\
=(p^2+6pq+9q^2) - (9s^2)\\
=(p+3q)(p+3q) - (9s^2)\\
=(p+3q)^2 - (9s^2)\\
\text{This is the difference of 2 squares}\\
=(p+3q\;\textcolor{red}{\textbf{-}}\;3s)(p+3q\;\textcolor{red}{\textbf{+}}3s)

The picture is blocked which suggests to me that the image is copyrighted.

Do you have the right to post this question geo?  Where does it come from?

1755/360 = 4 and a bit

so it is 4 revolutions plus a partial revolution

4*360=1440

1755-1440=315

so

Sin 1755 = sin 315

315 degrees is in the 4th quadrant where sin is always negative.

360-315=45 degrees

sin 315 = -sin 45 degrees 

Draw a right angled, isosceles triangle with the legs being 1 unit in length.  

the angles are 90, 45 and 45 degrees

Use pythagoras's Theorum to find the hypotenuse.

From that you can work out what sin45⁰  is.

I am not sure what 'up to two decimal places' means

12.09 is the only answer that is actually between 12 and 13.

If it means, rounded off to 2 decimal places, then still 12.09 is the only correct answer.

I am very glad CPhill helped you. 

All answerers will appreciate this thank you.

It is nice to be reminded that we are not always talking to brick walls. 

I hope you do well with all your future endeavors!