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4 years ago

11

Can you please help me just need the answer pls.please need help

1 answer:

stiv31 [10]4 years ago

7 0

5) the vertex is (-1,5) the a.o.s. is x=-1 the y intercept is (0,3)

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If 60% of a given number is 18.0 what is 25% of the given number

NNADVOKAT [17]

Answer:

7.5

Step-by-step explanation:

60% = 0.6

18 / 0.6 = 30 (given number)

25% = 0.25

30 * 0.25 = 7.5

Best of Luck!

3 0

3 years ago

Read 2 more answers

Manny and Emma are both competing in a long jump competition at their school. Manny can jump four fifths of the distance that Em

adell [148]

Answer:

50inches

Step-by-step explanation:

Let x be the height Emma can jump

(4/5)×x=40

x=(5/4)×40

x=50

5 0

3 years ago

2. The ratio of radii of two cylinders is 1:2 and heights are in the ratio 2:3. Find the ratio of their volumes.

Savatey [412]

Answer: $\frac{1}{6}$ or $1:6$

Step-by-step explanation:

The volume of a cylinder can be found with the following formula:

$V=\pi r^2h$

Where "r" is the radius and "h" is the height of the cylinder.

In this case, let be:

- $V_1$ the volume of one of this cylinders and $V_2$ the volume of the other one.

- $r_1$ the radius of the first one and $r_2$ the radius of the other cylinder.

- $h_1$ the height of one of them and $h_2$ the height of the other cylinder.

Then:

$V_1=\pi r_1^2h_1\\\\V_2=\pi r_2^2h_2$

Therefore, you know this:

$\frac{V_1}{V_2} =\frac{\pi r_1^2h_1}{\pi r_2^2h_2}$

Simplifying, you get:

$\frac{V_1}{V_2} =\frac{ r_1^2h_1}{ r_2^2h_2}$

Now, knowing the ratios given in the exercise, you can substitute them into the equation:

$\frac{V_1}{V_2} =\frac{1^2*2}{ 2^2*3}$

Evaluating, you get:

$\frac{V_1}{V_2} =\frac{2}{ 4*3}\\\\\frac{V_1}{V_2} =\frac{2}{12}\\\\\frac{V_1}{V_2} =\frac{1}{6}$

4 0

4 years ago

A researcher surveys middle-school students on their study habits. She finds that in a random sample of 28 middle-school student

Readme [11.4K]

Answer:

The margin of error is $E = 1.96 * \frac{ 0.92}{\sqrt{28 } }$

Step-by-step explanation:

From the question we are told that

The sample size is $n = 28$

The sample mean is $\= x = 2.4 \ hr$

The standard deviation is $\sigma = 0.92 \ hr$

Given that the confidence level is 95% the the level of significance can be evaluated as

$\alpha = 100 -95$

$\alpha = 5 \%$

$\alpha = 0.05$

Next we obtain the critical value of $\frac{\alpha }{2}$ from the normal distribution table,the value is $Z_{\frac{\alpha }{2} } = Z_{\frac{0.05}{2} } = 1.96$

Generally the margin of error is mathematically represented as

$E = Z_{\frac{\alpha }{2} } * \frac{\sigma }{\sqrt{n} }$

substituting values

$E = 1.96 * \frac{ 0.92}{\sqrt{28 } }$

$E = 0.3408$

5 0

4 years ago

Several people were polled regarding their favorite type of dessert. They were asked to choose one of the following: ice cream,

Darya [45]

Answer:

Step-by-step explanation:

D 30 would be the answer sorry if its wrong

7 0

4 years ago

Read 2 more answers