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Nata [24]
3 years ago
5

Sara spent half of her allowance going to the movies. She washed the family car and earned 9 dollars. What is her weekly allowan

ce if she ended with 16 dollars ?
Mathematics
2 answers:
Likurg_2 [28]3 years ago
4 0
$7 because if she has $16 by the end of the week and she earned $9 by washing the car, all you would have to do is subtract $9 from $16 and you would get her original allowance
Genrish500 [490]3 years ago
3 0
$7, I think. I would not be too sure about it, though.
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D

Step-by-step explanation:

by looking at the point you can see what has a slope.

it is also a decreasing slope

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Give an example of a time when you used estimation to solve a problem.
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Answer:

I wanted to know how many stars are in the sky above my house I counted and made the estimate of 80

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Multiple choice questions .
Arlecino [84]

Answer:

<h3>          1. a), </h3><h3>          2. c), </h3><h3>          3. b), </h3><h3>          4. a), </h3><h3>          5. a), </h3><h3>          6. c), </h3><h3>          7. ⁵/₃ or 5÷3 or 1 ²/₃</h3>

Step-by-step explanation:

1. 0 divided by any number is always 0

2.  7×(5-5) = 7×0 = 0

3. Integers between -5 and 5 are:

  -4, -3, -2, -1, 0, 1, 2, 3 and 4

4.  - ( |5 - 11| ) = - ( |-6| ) = - ( 6 ) = -6

5. Numerical coefficient is the number with its sign. No letters.

6. x increased by y means: y more than x. And x+y = y+x

7. one third of 5 means  \frac13\cdot5 so it is: \frac53=5:3=1\frac23

7 0
3 years ago
What is the distance from (-5,4) to (3,-2) on a coordinate plane ​
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3 years ago
Please show step by step of working out the value of r for which is A is aminimum and calculate the minimum surface area of the
almond37 [142]

Answer:

The minimum surface area of the container is 276.791 square units.

Step-by-step explanation:

Let be A(r) = \pi\cdot r^{2} + \frac{1000}{r}, \forall \,r \in \mathbb{R}, r \geq 0. The first and second derivatives of such function are, respectively:

First derivative

A'(r) = 2\cdot \pi \cdot r -\frac{1000}{r^{2}}

Second derivative

A''(r) = 2\cdot \pi +\frac{2000}{r^{3}}

The critical values of r are determined by equalizing first derivative to zero and solving it: (First Derivative Test)

2\cdot \pi \cdot r -\frac{1000}{r^{2}} = 0

2\cdot \pi \cdot  r^{3} - 1000 = 0

r = \sqrt[3]{\frac{1000}{2\pi} }

r \approx 5.419 (since radius is a positive variable)

To determine if critical value leads to an absolute minimum, this input must be checked in the second derivative expression: (r \approx 5.419)

A''(5.419) = 2 + \frac{2000}{5.419^{3}}

A''(5.419) = 14.568

The critical value leads to an absolute minimum, since value of the second derivative is positive.

Finally, the minimum surface area of the container is:

A(5.419) = \pi\cdot (5.419)^{2} + \frac{1000}{5.419}

A(5.419) \approx 276.791

The minimum surface area of the container is 276.791 square units.

7 0
3 years ago
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