Tracy saved her babysitting earnings for a month to buy some souvenirs while on vacation. She promised her three best friends a
2 answers:
The babysitting earnings is an illustration of a linear equation
The total babysitting earnings is $42
<h3>How to determine the babysitting earnings</h3>Represent the earnings with x.
- One third of the earning would be 1/3x
- The hat costs $12
The remaining amount would be:
x - 1/3x - 12
The remaining amount is $4 less than $20.
So, we have:
Collect like terms
Multiply through by 3
Simplify
Divide through by 2
Hence, the total babysitting earnings is $42
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Answer:
w-2u-v
Step-by-step explanation:
Given are three vectors u, v and w.
In R^2 we treat first element as x coordinate and 2nd element as y coordinate.
Thus we mark (1,2) in the I quadrant, (-3,4) in II quadrant and (5,0) on positive x axis 5 units form the origin.
b)
We have to find the values of a and b
]
Equate the corresponding terms
Divide II equation by 2 to get
Eliminate a
-5 = 5b: b=-1
a=-2
Hence
w = 2u-v
Answer: s = -3.3
<u>Step-by-step explanation:</u>
-3.3 = s
To Find :
Position vector at time and
.
Solution :
r (t) = 2 (t −7)i + 12t j
Putting t = 5 s and t = 8 s, we get :
r(5) = 2( -2 )i + 60j
r(5) = -4i + 60j
r(8) = 2i + 96j
Now, to find speed differentiating the r(t) w.r.t t :
Hence, this is the required solution.