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 #2
avatar+118723 
+10

http://www.mathopenref.com/coordgeneralellipse.html

 

If the centre is (0,0)

Let the end of the horizontal axis is  A(5,0)

The foci is     $$S_1(3,0)$$

If you sketch this it is easy to see that the other foci is     $$S_2(-3,0)$$

Let the point   B(0,b) be the end of the vertical axis.

NOW

$$\\S_1B=BS_2
S_1A+AS_2\;\; must\; \;equal \;\; S_1B+BS_2\\\\
2+8=S_1B+BS_2\\\\
10=5+5\\\\
so\\\\
B(0,4)\\\\
$equation of the ellipse$\\\\
\frac{x^2}{5^2}+\frac{y^2}{4^2}=1\\\\
\frac{x^2}{25}+\frac{y^2}{16}=1$$

.
Jun 13, 2015
 #99
avatar+4711 
+15

All of the topics above are what I've been learning for the past year so, that will be in the exam.

 

1.PLACE VALUE AND POWERS OF 10: Seems like an easy thing to do.

 

2. ROUNDING AND ESTIMATION:Rounding I know, but sometimes i need to catch up on it.

 

3.ADDING AND SUBTRACTING DECIMAL: Is easy

 

4.MEANTAL CALCULATION: I can do it.

 

5. WRITTEN CALCULATIONS OF POSITIVE AND WHOLE NUMBER: Yep.

 

6. FACTORS MULTIPLES ND PRIMES:I can do it.

 

7. PROPORTIONAL REASONING: (I had an idea of what that was but now i know) I can do that.

http://teachmath.openschoolnetwork.ca/grade-6/proportional-reasoning/

 

8. MORE CALCULATIONS: Ehh... I always mess up with Negatives! 

 

9.INTRODUCTION TO ALGEBRA: I can do that.

 

 

10. SOLVING EQUATIONS: I can do that.

 

 

11. ANGLES: Partially, I know it but it's not polished.

 

12. PROPERTIES OF SHAPES: I hate shapes, i don't understand how to find things like the volume and surface area of a 3d shape and others.

 

13. FRACTIONS: I can do it. 

 

14. PERCENTAGE: Yes

 

2,8, 11, 12  Is what I'm struggling.

Jun 13, 2015

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