3 years ago

She mowed 10 lawns for $90. How much did she make per lawn?

Mathematics

1 answer:

Evgen [1.6K]3 years ago

8 0

Answer:

9$ per lawn

Step-by-step explanation:

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16x2 + 10x – 27 = -6x + 5<br> What are the solutions to this equation ?<br> X<br> x=

bonufazy [111]

Answer:

x=-2 x=1

Step-by-step explanation:

16x2 + 10x – 27 = -6x + 5

Add 6x to each side

16x^2+6x + 10x – 27 = -6x+6x + 5

16x^2 +16x -27 = 5

Subtract 5 from each side

16x^2 + 16x – 27-5 = 5 - 5

16x^2 +16x -32 = 0

Factor out 16

16 (x^2 +x-2)=0

Factor

16 (x+2) (x-1) =0

Using the zero product property

(x+2) =0 x-1=0

x=-2 x=1

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3 years ago

Two ratios that are equivalent to 5/7

grigory [225]

You could pick just about anything 3/8 is not the same thing as 5/7 and neither is 3/4

Something that is equivalent would be something like 10/14 or 20/28

3 0

3 years ago

We wish to construct a 90% confidence interval on the mean of a population known to be normally distributed based on a sample of

sergiy2304 [10]

Answer:

Margin of error = 0.773

Step-by-step explanation:

We are given the following information in the question.

Sample size, n = 20

Sample mean = 8

Sample standard deviation = 2

90% Confidence interval

$\bar{x} \pm t_{critical}\displaystyle\frac{s}{\sqrt{n}}$

Putting the values, we get,

$t_{critical}\text{ at degree of freedom 19 and}~\alpha_{0.10} = \pm 1.729$

Margin of error:

$t_{critical}\displaystyle\frac{s}{\sqrt{n}}$

Putting the values, we get,

$1.729(\frac{2}{\sqrt{20}} ) = 0.773$

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3 years ago

16. The original price of a tie is $12.50. The new price of the tie is now

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The tie was marked down by 40%

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2 years ago

An equilateral triangle has a semiperimeter of 6 meters. What is the area of the triangle? Round to the nearest square meter. 2

Lelu [443]

I wanna say 7 is the neatest round

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3 years ago

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