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3 years ago

In math how do you estimate?

1 answer:

5 0

For example, if you are asked to estimate the sum of 545 + 723, you have to round the two numbers to the hundreds, so 545 would equal 500 and 723 would equal 700

500 + 700 = 1200, which wud be the estimation f the sum

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10# A consumer advocacy group is doing a large study on car rental practices. Among other things, the consumer group would like

ella [17]

ANSWER:

104

STEP-BY-STEP EXPLANATION:

Given:

Standard deviation (σ) = 700

Confidence level = 95%

Mean error (Eμ) = 135

We have for a confidence level of 95%:

$\begin{gathered} \alpha=100\%-95\%=5\%=0.05 \\ \\ \alpha\text{/2}=\frac{0.05}{2}=0.025 \\ \\ \text{ The corresponding Z value for \alpha/2 = 0.025 is as follows:} \\ \\ Z_{\alpha\text{/2}}=1.96 \end{gathered}$

Now, we calculate the minimum value of the sample size as follows:

$\begin{gathered} n=\left(\frac{Z_{\alpha\text{/2}}\cdot\sigma}{E}\right)^2 \\ \\ \text{ We replacing:} \\ \\ \:n=\left(\frac{1.96\cdot 700}{135}\right)^2 \\ \\ \:n=103.2858\cong104 \end{gathered}$

The minimum sample size needed is 104

3 0

1 year ago

Which is f(-3) for quadratic function graphed

liberstina [14]

The -3 in f(-3) is the X coordinate, so you need to find where the line is on the Y coordinate at that point.

The line is at Y = -9

3 0

4 years ago

THIS IS URGENT 226 in 8 in x

Lubov Fominskaja [6]

Answer:

D.) 9√2

Step-by-step explanation:

a^2 + b^2 = c^2

x^2 + 8^2 = √226^2

x^2 + 64 = 226

x^2 = 226 - 64

x^2 = 162

√x^2 = √162

√162 = √81 • √2

√81 = 9

√2 = √2

9√2

3 0

3 years ago

A sea turtle swims at a speed of 27 kmh. A girl swims 14 dm per s.

lana66690 [7]

To compare the speed for the both of them, it would be helpful to convert the units to the same units in this case to units of meters per minute. We calculate as follows:

27 / 60 minutes = 0.45 km/minute
0.45 × 1000 = 450 m/minute

14 x 60 = 840 dm/minute
840 / 10 = 84 m/minute

450 - 84 = 366 m/minute faster than the girl

5 0

3 years ago

Marie has hours to write a 45 page chapter for her book if Marie writes at a constant speed of 4 pages per hour will Marie compl

Anastasy [175]

Answer:

She will not complete the book on time

Step-by-step explanation:

4 pages an hr

45/4 = 11.25, meaning it will take 11.25 hours for Marie to finish her book

11.25 hours= 11 hours 15 minutes

7 0

3 years ago