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lesantik [10]
3 years ago
8

In an arboretum, the heights of five trees were 21 feet, 31 feet, 36 feet, 28 feet,

Mathematics
1 answer:
lbvjy [14]3 years ago
6 0

Answer:

26

Step-by-step explanation:

(21+31+36+28+26+x)/6=28

21+31+36+28+26+x= 28×6

142+x =168

x=168-142

x=26

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The sum of the reciprocals of two consecutive odd integers is 24/143. find the two integers.
nordsb [41]
Let one integer be x, the consecutive odd integer is x+2
reciprocals are 1/x and 1/(x+2)
1/x +1/(x+2)=24/143
make the denominators the same:
(x+2)/[x(x+2)] +x/[x(x+2)]=24/143
143(2x+2)=24(x)(x+2)
286x+286=24x²+48x
24x²-238x-286=0
use the quadratic formula: x=22 this doesn't work because 22 is not an odd number.
or x=-2.1666666666 (this is not an integer)

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4 0
3 years ago
- 16m’n-(-25m’n)+(-7m’n)Which of the following is equivalent to the expression above?
Westkost [7]

As a rule , - times - = + and - times + = -

\begin{gathered} -16m^2n-(-25m^2n)+(-7m^2n\text{ ) } \\ =-16m^2n+25m^2n-7m^2n\text{  ( based on the rule above )} \\ =+9m^2n-7m^2n\text{    ( -16 + 25 = + 9 )} \\ =+2m^2n \end{gathered}

Therefore the correct answer to the question is 2m squared n

5 0
1 year ago
George walked around the entire perimeter of his rectangular garden. the length of his garden was 12 yards and the width was 8 y
makkiz [27]
It is 40 yards he walked

5 0
3 years ago
To multiply a whole number by a fraction, you can first write the whole number as a fraction by placing the whole number in the
Gnom [1K]
No. the product stays the same because it is still the same number, just in fraction form.

6 0
3 years ago
Can anyone please help me find the length of X? <br>​
Alex_Xolod [135]

Solution:

<u>Note that:</u>

  • 2(Perimeter of smaller triangle) = Perimeter of larger triangle

<u>Using the perimeter of the smaller triangle, solve for x.</u>

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  • => 2(3.5 + x + h) = 7 + 4 + 2h
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  • => 2x = 4
  • => x = 2

The length of x is 2 units.

8 0
2 years ago
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