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3 years ago

11

What is 20% off of 30 dollars

2 answers:

EastWind [94]3 years ago

6 0

An easy way of finding percents is you take the number want to find the percent of which in your case is 30. and you wan to take off 20%. you would do

30 * 0.20 which would equal 5

Drupady [299]3 years ago

4 0

5 dollars is the answer

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The top of a table is a parallelogram with a base of 28 cm and a height of 20 cm. Patty wants to cover the table with tiles that

suter [353]

The area of the top of the table is 28 × 20 = 560 cm2. The area of Patty’s tiles is 8 cm2 each and the area of Jake’s tiles is 9 cm2 each. Patty will need 560 ÷ 8, or 70, tiles. Jake will need 560 ÷ 9, or about 63, tiles. So, Patty will use about 7 more tiles.

3 0

3 years ago

Read 2 more answers

A study of peach trees found that the average number of peaches per tree was 725. The standard deviation of the population is 70

TEA [102]

Answer:

She needs to sample 189 trees.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1 - 0.95}{2} = 0.025$

Now, we have to find z in the Ztable as such z has a pvalue of $1 - \alpha$ .

That is z with a pvalue of $1 - 0.025 = 0.975$ , so Z = 1.96.

Now, find the margin of error M as such

$M = z\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

The standard deviation of the population is 70 peaches per tree.

This means that $\sigma = 70$

How many trees does she need to sample to obtain an average accurate to within 10 peaches per tree?

She needs to sample n trees.

n is found when M = 10. So

$M = z\frac{\sigma}{\sqrt{n}}$

$10 = 1.96\frac{70}{\sqrt{n}}$

$10\sqrt{n} = 1.96*70$

Dividing both sides by 10:

$\sqrt{n} = 1.96*7$

$(\sqrt{n})^2 = (1.96*7)^2$

$n = 188.2$

Rounding up:

She needs to sample 189 trees.

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3 years ago

Oml<br> 1/6cm<br> 4cm<br> What the surface area of this shape

Kitty [74]

1/6 x 4 is .666666...

6 0

3 years ago

joshua,steve,antonioare baking pie.joshua has 1/2 cups of flour, steve has 1 3/4 cups of flour ,and Antonio has 1 4/6 cups of fl

photoshop1234 [79]

Answer:

They all have 3 cups together.

Step-by-step explanation:

I added 1/2 plus 1 3/4 plus 1 4/6 on a calculator and got 3.91666666667

Basically 3.

7 0

3 years ago

11. What is the y-intercept of a line that passes through the point (5,17)

Viefleur [7K]

$\qquad \qquad \bf \huge\star \: \: \large{ \underline{Answer} } \huge \: \: \star$

y - intercept = -3

$\textsf{ \underline{\underline{Steps to solve the problem} }:}$

Equation of straight line in point - slope form :

$\qquad❖ \: \sf \:y - y1 = m(x - x1)$

( m = slope = 4, point (5 , 17) )

$\qquad◈ \: \: \sf \: y - 17 = 4(x - 5)$

$\qquad◈ \: \: \sf \: y - 17= 4x - 20$

$\qquad◈ \: \: \sf \: y = 4x - 20 + 17$

$\qquad◈ \: \: \sf \: y = 4x - 3$

Now, it's the form of line in slope - intercept form, ( slope = coefficient of x = 4 and y - intercept = -3 )

$\qquad \large \sf {Conclusion} :$

$\qquad◈ \: \: \sf \: y \: \: int = - 3$

8 0

2 years ago