3 years ago

How many centimeters long is a 21 board

Mathematics

2 answers:

neonofarm [45]3 years ago

4 0

53.34 is the answer
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scoundrel [369]3 years ago

3 0

21, it says it right in the name.

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What is the solution of n/6 = 36

igor_vitrenko [27]

Answer:

n=216.

Step-by-step explanation:

Very simple problem - we just have to multiply both sides by 6, which will get rid of the 6 on the left.

36 x 6 = 216

8 0

2 years ago

Solve −2x2 +3x − 9 = 0

luda_lava [24]

-2x^2 + 3x - 9 = 0
The quadratic is not factorable so quadratic formula must be used.
x = (-b + - √(b^2 - 4ac))/2a
a = -2, b = 3, c = -9
x = (-3 + - √(9 - 4*-2*-9))/-4
x = (-3 + - √(-63))/-4
x = -3 + - 3i√7
   --------------
   -4
x = 3 + 3i√7 x = 3 - 3i√7
    ------------ ------------
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8 0

2 years ago

If you run a marathon of 26 1/5 miles in a time of 5 4/5 how far do you run in 1 hour<br><br>pls

alisha [4.7K]

First let's make both the miles and the hours ran improper fractions:

$26+\frac{1}{5}=\frac{131}{5}\\ 5+\frac{4}{5}=\frac{29}{5}$

So, to find our miles per hour, we have to divide the miles by the hours to get: $\frac{\frac{131}{5}\text{miles}}{\frac{29}{5}\text{hours}}=\frac{131\text{miles}}{29\text{hours}} \\ \text{ Now we have to divide the top and the bottom by 29 to get our miles per hour so: }\\ \frac{\frac{131}{29}}{\text{hour}} \approx \frac{4.52 \text{miles}}{\text{hour}}$