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3 years ago

11

Whosever answers first gets marked brainliest!

1 answer:

tresset_1 [31]3 years ago

7 0

Answer:

Step-by-step explanation:

C.

$5.85 / 13 cans = $0.45/can

$9.45 / 21 cans = $0.45/can

13 cans for $5.85 = 21 cans for $9.45

The ratios are equal.

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I need help I need to get a good grade in math and I was just wondering if anyone could take the time to help me with these ques

JulsSmile [24]

1. a

2. b

3. a

4. c

hope this helps :)

5 0

3 years ago

Evaluate. Write your answer as a mixed number <br> 9 4/5 divided 3 1/2=

mezya [45]

Answer:

2 $\frac{4}{5}$

7 0

4 years ago

Read 2 more answers

Will mark brainliest please help ASAP ASAP A bag contains 10 marbles.Four of them are red, three blue two white, and one yellow.

tatyana61 [14]

Answer: 2/5 or 40%

Step-by-step explanation:

10 total

4 red

4/10 are red

as a reduced fraction: 2/5

as a percent: 40%

7 0

3 years ago

Read 2 more answers

Pam has 90 m of fencing to enclose an area in a petting zoo with two dividers to separate three types of young animals. The thre

andrew-mc [135]

Answer:

The area function is

$A=\frac{135}{2}x-\frac{9}{2}x^2$ .

The domain and range of A is $(0,15m)$ and $(0, 253.125 m^2]$ .

Step-by-step explanation:

The given length of fencing is $90 m$ .

Let the length and width of each pen be $x$ and $y$ respectively as shown in the figure.

As there are 3 pens, so, the total area,

$A= 3 xy \;\cdots (i)$

From the figure the total length of fencing is $6x+4y$ .

Here, for a significant area for the animals, $x>0$ as well as $y>0$ as $x$ and $y$ are the sides of ben.

From the given value:

$6x+4y=90\;\cdots (ii)$

$\Rightarrow y=\frac {45}{2}-\frac{3x}{2}$

Now, from equation (i)

$A=3x\left(\frac {45}{2}-\frac{3x}{2}\right)$

$\Rightarrow A=\frac{135}{2}x-\frac{9}{2}x^2\;\cdots (iii)$

This is the required area function in the terms of variable $x$ .

For the domain of area function, from equation (ii)

$x=15-\frac{2y}{3}$

$\Rightarrow x$ [as y>0]

So, the domain of area function is $(0,15m)$ .

For the range of area function:

As $x \rightarrow 0$ or $y\rightarrow 0$ , then $A\rightarrow 0$ [from equation (i)]

$\Rightarrow A>0$

Now, differentiate the area function with respect to $x$ .

$\frac {dA}{dx}=\frac{135}{2}-9x$

Equate $\frac {dA}{dx}$ to zero to get the extremum point.

$\frac {dA}{dx}=0$

$\Rightarrow \frac{135}{2}-9x=0$

$\Rightarrow x=\frac{15}{2}$

Check this point by double differentiation

$\frac {d^2A}{dx^2}=-9$

As, $\frac {d^2A}{dx^2}$ , so, point $x=\frac{15}{2}$ is corresponding to maxima.

Put this value back to equation (iii) to get the maximum value of area function. We have

$A=\frac{135}{2}\times \frac {15}{2}-\frac{9}{2}\times \left(\frac {15}{2}\right)^2$

$\Rightarrow A=253.125 m^2$

Hence, the range of area function is $(0, 253.125 m^2]$ .

4 0

4 years ago

Emily can bake 5 Christmas cupcakes in 3.5 hours. How many cupcakes can she bake in 7 hours?

ycow [4]

Answer:

10

Step-by-step explanation:

6 0

3 years ago