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Leya [2.2K]
3 years ago
6

Kelly Jackson is an administrative assistant. She earns a weekly salary of $412.00. She applied and wad hired for an administrat

ive specialist. Kelly's annual salary in her new position will be $24,388.00. How much ch will Kelly's weekly salary be in her position?
Mathematics
1 answer:
Sedbober [7]3 years ago
7 0

Given that weekly salary of Kelly Kackson is 412$ and new annual salary of Kelly Jackson is $24,388.00 .That means Kelly Jackson earns 24388$ per 1 year in the new position.

To find weekly salary in the new position, we have to divide annual salary in new position with "total number of weeks in a year".

Since 1 year = 52 weeks.

Weekly salary = \frac{24388}{52}  = $469

Hence weekly salary of Kelly Jackson in new position is $469.

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The correct question is:

(a) Find the derivative of r(t) = (2 + t³)i + te^(−t)j + sin(6t)k.

(b) Find the unit tangent vector at the point t = 0.

Answer:

The derivative of r(t) is 3t²i + (1 - t)e^(-t)j + 6cos(6t)k

(b) The unit tangent vector is (j/2 + 3k)

Step-by-step explanation:

Given

r(t) = (2 + t³)i + te^(−t)j + sin(6t)k.

(a) To find the derivative of r(t), we differentiate r(t) with respect to t.

So, the derivative

r'(t) = 3t²i +[e^(-t) - te^(-t)]j + 6cos(6t)k

= 3t²i + (1 - t)e^(-t)j + 6cos(6t)k

(b) The unit tangent vector is obtained using the formula r'(0)/|r(0)|. r(0) is the value of r'(t) at t = 0, and |r(0)| is the modulus of r(0).

Now,

r'(0) = 3t²i + (1 - t)e^(-t)j + 6cos(6t)k; at t = 0

= 3(0)²i + (1 - 0)e^(0)j + 6cos(0)k

= j + 6k (Because cos(0) = 1)

r'(0) = j + 6k

r(0) = (2 + t³)i + te^(−t)j + sin(6t)k; at t = 0

= (2 + 0³)i + (0)e^(0)j + sin(0)k

= 2i (Because sin(0) = 0)

r(0) = 2i

Note: Suppose A = xi +yj +zk

|A| = √(x² + y² + z²).

So |r(0)| = √(2²) = 2

And finally, we can obtain the unit tangent vector

r'(0)/|r(0)| = (j + 6k)/2

= j/2 + 3k

8 0
3 years ago
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