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3 years ago

What number is equivalent to -21

Mathematics

2 answers:

Maksim231197 [3]3 years ago

8 0

Well, $-21=x$ if $x=-21$ so that $-21=-21$ is true.

Natasha_Volkova [10]3 years ago

6 0

-21/1 could be the answer since it equals -21 but idk for sure. sorry

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if a 14 foot tree casts a 8 foot long shadow. how tall is a tree that casts a 4 foot long shadow?

kvasek [131]

7-foot

EXPLANAT

Given:

14 foot tree

8foot shadow

4foot shadow

Let h be the height of a tee that casts a 4 foot long shadow.

Using proportion;

14 foot = 8 ft shadow

h = 4 ft shadow

Cross - multiply

8h = 56

Divide both-side by 8

h = 7 foot.

Hence, the tree is 7-foot.

4 0

1 year ago

Find the midpoint of side EF.

Fiesta28 [93]

The answer is (-0.5,4.5)

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4 years ago

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An environmental group at a local college is conducting independent tests to determine the distance a particular make of automob

melomori [17]

Answer:

$26.5265$

Step-by-step explanation:

<u>Confidence Interval</u>

When the population standard deviation $\sigma$ is known, the formula for a confidence interval for a population mean $\bar x$ is:

$\displaystyle \bar x \pm z\frac{\sigma}{\sqrt{n}}$

Where n is the sample size and z is the corresponding z-value from the standard normal distribution for the selected confidence level. The value of z for a 95% confidence interval is z=1.96. The rest of the values are

$\bar x=28.2,\ \sigma=2.7, \ n=10$

Calculating the confidence interval

$\displaystyle 28.2 \pm 1.96\frac{2.7}{\sqrt{10}}$

$\displaystyle 28.2 \pm 1.6735$

Or, equivalently

$26.5265$

6 0

3 years ago

(27 thousands 3 hundreds 5 ones) x 10

anyanavicka [17]

Answer:

Two hundred seventy three thousand and fifty .

Step-by-step explanation:

Given : (27 thousands 3 hundreds 5 ones) x 10

Solution:

27 thousands 3 hundreds 5 ones = 27,305

So, $27,305 \times 10$

$273,050$

Periods are counted from last .

The 1st period consists of ones, tens and hundred.

The 2nd period consists of thousand, 10 thousand and 100 thousands.

The 3rd period consists of million, 10 million and 100 million.

So, 273,050 is Two hundred seventy three thousand and fifty

Hence (27 thousands 3 hundreds 5 ones) x 10 is Two hundred seventy three thousand and fifty .

4 0

3 years ago

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I cannot understand this can you guys help

igor_vitrenko [27]

The mean is not the same thing as median
mean=78+81+85+87=331
mean=331/4=82.75
median is the middle number, but you have a par set of numbers, so your median will be the middle numbers 78,81,85,87 , which are 81+85=166, 166/2=83
83 is your median

5 0

3 years ago