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Illusion [34]
3 years ago
13

Lea and kim each improve their yard by planting daylilies and shrubs. they bought their supplies from the same store. lea spent

$86 on 7 daylilies and 6 shrubs. kim spent $132 on 9 daylilies and 12 shtubs. find the cost of one daylilies and the cost of one shrub
Mathematics
1 answer:
gregori [183]3 years ago
6 0
<span>Let us represent the cost of day lilies by d and the cost of shrubs by s. We set up two equations,
Lea:
7d+6s=86

Kim:
9d+12s=132

Rearranging Lea's equation to make d the subject,
d= 86-6s /7

Substituting this value of d into Kim's equation:

9(86-6s /7) +12s=132
102s+12s=132
114s=132
s=1.16

Substituting this value into the original equation:

9d+12(1.16)=132
9d+13.92=132
9d=118
d=13.12


The cost of a day lily is $13.12 and the cost of a shrub is $1.16.</span>
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What is the geometric mean of 4 and 10
GalinKa [24]

Answer: 6.3

Step-by-step explanation:

The formula for geometric mean is given as :

G.m = \sqrt{pq}

Therefore , the geometric mean between 4 and 10 will be :

G.m = \sqrt{4(10)}

      = \sqrt{40}

      = 2\sqrt{10}

     = 6.3

8 0
3 years ago
A sample with a mean of m = 40 and a variance of s2 = 20 has an estimated standard error of 1 point. how many scores are in the
tamaranim1 [39]

The correct option is 20.

The score found for the sample is 20.

<h3>What is Standard error?</h3>

A standard error is a statistic that is applied to test the distribution of data. This metric is comparable to standard deviation. We can calculate the standard error if we know the sample size & standard deviation. It assesses the mean's precision.

Now, according to the question;

Sample mean; \bar{x}=40

Sample variance; s^{2}=20

Thus, s=\sqrt{20}=4.47

Standard error SE = 1

The amount of scores with in sample must be determined here.

The standard error formula is as follows:

S E=\frac{s}{\sqrt{n}}

We might rearrange the formula as follows:

\begin{aligned}\sqrt{n} &=\frac{s}{S E} \\n &=\left(\frac{s}{S E}\right)^{2}\end{aligned}

Substituting the values;

\begin{aligned}&n=\left(\frac{4.47}{1}\right)^{2} \\&n=19.98\end{aligned}

The sample's number of scores n = 19.98 = 20 (round up)

Therefore, the scores are in the sample is 20.

To know more about the Standard error, here

brainly.com/question/14467769

#SPJ4

3 0
1 year ago
What value of x makes the equation below true?
AVprozaik [17]
With these, I normally use the method of "Plug and Chug" lol. I think your answer is C. -6.
7 0
3 years ago
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Simplify the expression below. (-5 × -4)÷(-3+5)​
ohaa [14]

Answer:

-10

Step-by-step explanation:

7 0
2 years ago
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Answer please and explain some of them!
boyakko [2]
The first one is < because if you have 5 part of 7, you have more parts than if you have 4 parts of 7, but it’s negative so it’s the opposite
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