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4 years ago

Please answer this question I need it fast:

2 answers:

6 0

Let's call:
M = necklaces owned by Mary Sue
B = necklaces owned by Betty

You know that:
M + B = 603
M - B = 115

Therefore, when you have the sum and the difference of two numbers, in order to find the biggest number you have to sum the sum and the difference and divide it by 2, and in order to find the smallest number you have to subtract the difference from the sum and divide it by 2:

M = [(M + B) + (M - B)] ÷ 2
 = [603 + 115] ÷ 2
 = 359

B = [(M + B) - (M - B)] ÷ 2
 = [603 - 115] ÷ 2
 = 244

Hence, Mary Sue has 359 necklaces and Betty has 244 necklaces.

pav-90 [236]4 years ago

4 0

Answer:

mary sue: 359, betty; 244

Step-by-step explanation:

⇔↓⊕㏒㏑∞

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Answer:

x=130 I believe

Step-by-step explanation:

28+8+14+x=180

50+x=180

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3 years ago

Explain the difference between prime and composite numbers

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Prime only has two factors one and its self a composite number has more factor than one and its self
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3 years ago

A pumpkin is launched from the top of a 20 foot tall platform at an initial velocity of 84 feet per second. The height, h, of th

Gennadij [26K]

<h2>Explanation:</h2>

In this problem we have a pumpkin is launched from the top of a 20 foot tall platform at an initial velocity of 84 feet per second. So the height, h, of the pumpkin at time t seconds after the launch can be modeled by the equation:

$h(t) = -16t^2 + 84t + 20$

So this is the equation of a parabola. The maximum of this parabola occurs at its vertex. So let's find this vertex:

$\text{The x-value of the vertex is}: \\ \\ t=-\frac{b}{2a} \\ \\ \\ Where: \\ \\ a=-16 \\ \\ b=84 \\ \\ c=20 \\ \\ \\ t=-\frac{84}{2(-16)} \\ \\ t=-\frac{84}{-32} \\ \\ t=\frac{21}{8}=2.625 \\ \\ h(2.625)=-16(2.625)^2+84(2.625)+20 \\ \\ h(2.625)=-110.25+220.5+20 \\ \\ h(2.625)=130.25m$

Finally, the maximum occurs at time 2.625 seconds when the height is 130.25m

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4 years ago

Which of the following inequalities matches the graph?

TiliK225 [7]

Since the shading on the left side, and the line goes through the x axis, your answer would be B.

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3 years ago

Read 2 more answers

We are planning on introducing a new internet device that should drastically reduce the amount of viruses on personal computers.

Alexus [3.1K]

Answer:

The sample size required is 289.

Step-by-step explanation:

Let p be population proportion of people that would buy the product.

It is provided that the nationwide poll on this type of product and price was run earlier this year, with percentages running from 75% to 80%.

Assume that the sample proportion of people that would buy the product is, $\hat p=0.75$ .

A 95% Confidence Interval is to be constructed with a margin of error of 5%.

We need to determine the sample size required for the 95% Confidence Interval to be within 5% of the actual value.

The formula to compute the margin of error for a (1 - α)% confidence interval of population proportion is:

$MOE=z_{\alpha/2}\times\sqrt{\frac{\hat p(1-\hat p)}{n}}$

The critical value of z for 95% confidence interval is,

z = 1.96.

Compute the sample size required as follows:

$MOE=z_{\alpha/2}\times\sqrt{\frac{\hat p(1-\hat p)}{n}}$

$n=[\frac{z_{\alpha/2}\ \sqrt{\hat p(1-\hat p)} }{MOE}]^{2}$

$=[\frac{1.96\cdot \sqrt{0.75(1-0.75)} }{0.05}]^{2}\\\\=(16.9741)^{2}\\\\=288.12007081\\\\\approx 289$

Thus, the sample size required is 289.

8 0

3 years ago