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3 years ago

7

Olivia is making scarves. Each scarf will have 3 rectangle, and 2/3 of the rectangles will be purple. How many purple rectangles

she need for 2 scarves.

1 answer:

Salsk061 [2.6K]3 years ago

6 0

Answer:

she will use 4.

Step-by-step explanation:

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Westkost [7]

Answer: - 3/2

Step-by-step explanation:

Use this formula to find the slope for any two given points.

(4, 3) and (6, 0)

↓ ↓ ↓ ↓

x1 y1 x2 y2

y2 - y1 0 - 3

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x2 - x1 6 - 4

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Leto [7]

The answer & explanation for this question is given in the attachment below.

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3 years ago

The side length, s, of a cube is x – 2y. If V = s3, what is the volume of the cube? x3 – 6x2y + 12xy2 – 8y3 x3 + 6x2y + 12xy2 +

otez555 [7]

V = x³ - 6x²y + 12xy² - 8y³

V = (x - 2y)³

= (x - 2y)(x - 2y)(x - 2y) ( expand first pair of factors )

= (x² - 4xy + 4y²)(x - 2y) ( multiply terms in first by terms in second )

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4 years ago

Read 2 more answers

Solve the simultaneous equations.

Vera_Pavlovna [14]

Answer:

x = 1.5 ; y = -0.5

Step-by-step explanation:

2x + 4y = 1 ---------------------(i)

3x - 5y =7 ----------------------(ii)

(i) * 5 10x + 20y = 5

(ii)*4 <u> 12x -20y = 28 </u>

add, 22x = 33 { here y will be eliminated}

x = 33/22 = 3/2

x = 1.5

Put the value of x in equation (i)

2*1.5 + 4y = 1

3 + 4y = 1

4y = 1-3

4y = -2

y = -2/4 = -1/2

y = -0.5

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3 years ago

Mr. Bond’s class wanted to estimate the mean mass of Snickers Fun Size bars. They randomly selected 74 bars and recorded the mas

AleksAgata [21]

Step 1: Find the standard error (SE)

The standard error is given by

$SE=\frac{s}{\sqrt[]{n}}$ $\begin{gathered} \text{ Where } \\ SE=\text{ the standard error} \\ s=\text{ the sample standard deviation} \\ n=\text{ the sample size} \end{gathered}$

In this case,

$n=74,s=0.76$

Therefore,

$SE=\frac{0.76}{\sqrt[]{74}}\approx0.0883$

Step 2: Find the alpha level (α)

$\alpha=1-\frac{(\text{Confidence level})}{100}$ $\alpha=1-0.99=0.01$

Step 3: Find the critical probability (P*)

$P^{\prime}=1-\frac{\alpha}{2}$

Therefore,

$P^{\cdot}=1-\frac{0.01}{2}=0.995$

Step 4: Find the critical value (CV)

The critical value the z-score having a cumulative probability equal to the critical probability (P*).

Using the cumulative z-score table we will find the z-score with value of 0.995

Hence,

$CV=2.576$

Step 5: Find the margin of error (ME)

$ME=SE\times CV$

Therefore,

$ME=0.0883\times2.576=0.2275$

Step 6: Find the confidence interval (CI)

$\begin{gathered} CI\text{ is given by} \\ CI=(\bar{x}-ME,\bar{x}+ME) \\ \text{ In this case} \\ \bar{x}=17.1 \end{gathered}$

Therefore,

$CI=(17.1-0.2275,17.1+0.2275)=(16.8725,17.3275)$

Hence there is a 99% probability that the true mean will lie in the confidence interval

(16.8725, 17.3275)

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