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Few C3 Qs watch

1. firstly, just wondering if i've got this right:

The surface area of a sphere is increasing at the rate of Find the rate of increase of the radius of the sphere when the radius is 5cm.

at

2) i) Use Simpson's Rule with 5 ordinates to find the value of

Using x at 0, 0.5, 1.0, 1.5, 2 (4 strips).. i used the rule to find
yo + 4y1 + 2y2 + 4y3 + y4 = 6.2022... then multiplied this by (0.5/3) = 1.0337 units squared. Anywhere i can check this is right quickly?

ii) Hence find
what do i do with answer in i) to get this

thanks
2. (Original post by Salinger)
firstly, just wondering if i've got this right:

The surface area of a sphere is increasing at the rate of Find the rate of increase of the radius of the sphere when the radius is 5cm.

at

2) i) Use Simpson's Rule with 5 ordinates to find the value of

Using x at 0, 0.5, 1.0, 1.5, 2 (4 strips).. i used the rule to find
yo + 4y1 + 2y2 + 4y3 + y4 = 6.2022... then multiplied this by (0.5/3) = 1.0337 units squared. Anywhere i can check this is right quickly?

ii) Hence find
what do i do with answer in i) to get this

thanks
Question 1) Your should not have jumped to the top!

ii)
3. (Original post by Mr M)
Question 1) Your should not have jumped to the top!

ii)
Oops, i did have it as , just did latex wrong is that correct now?

and ii) will therefore be

thanks
4. (Original post by Salinger)
Oops, i did have it as , just did latex wrong is that correct now?

and ii) will therefore be

thanks
Both sound good to me.

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