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vagabundo [1.1K]
3 years ago
11

21z^2+85z-26=0 Please solve using factoring

Mathematics
1 answer:
const2013 [10]3 years ago
7 0
Trial and error
either
(z )(21z )
(3z )(7z  )
and ending with
( -1)( 26)
( -26)( 1)
( -2)( 13)
( 2)( -13)
trial enderor


after some times
(3x+13)(7x-2)=0

set to zero
3x+13=0
3x=-13
x=-13/3

7x-2=0
7x=2
x=2/7

x=-13/3 or 2/7
it would be easier to use quadratic formula though
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5/6 , 7/18 , 11/24 , 19/36 in descending order
motikmotik

Answer: 5/6, 19/36, 11/24, 7/18

Step-by-step explanation:

Descending order is going from largest to smallest. We can do this by comparing the fractions. We make all the fractions have the same denominator. Then we will see which has the larger numerator.

\frac{5}{6} , \frac{7}{18} , \frac{11}{24} , \frac{19}{36}

A common denominator we can use is 72, since it is a common multiple.

\frac{60}{72} ,\frac{28}{72}, \frac{33}{72}, \frac{38}{72}

Now that all the numbers have the same denominator, we compare to see which number is largest to smallest.

\frac{60}{72} ,\frac{38}{72} ,\frac{33}{72} ,\frac{28}{72}

With our descending order, let's put it back into the original fractions.

\frac{5}{6} ,\frac{19}{36} ,\frac{11}{24} ,\frac{7}{18}

6 0
3 years ago
Write the number 241 in words
meriva
Two hundred fourty one
8 0
3 years ago
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A park has two biking trails. Tailand Trail is 5 3/10 long. Mayland Trail is 2 4/5 miles long. How much longer is Tailand Trail
zvonat [6]

Answer: 2 1/2 miles

Step-by-step explanation:

To subtract fractions with different denominators (in this problem they are 10 and 5), you have to find the least common denominator or LCD (10). Then you have to multiply the numerator and the denominator of 4/5 by 2 to turn the denominator into the LCD (10).

1. So 2 4/5 turns into 2 8/10

2. Then subtract 2 8/10 from 5 3/10 to get the answer 2 1/2

6 0
3 years ago
Solve for r<br><br> 2/3 = 3r
Darya [45]
2/3=3r
divide both sides by 3
remember that dividng by 3 is the same as multiplyint by 1/3
2/3 times 1/3=2/9=r

r=2/9
5 0
3 years ago
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The length of a hypotenuse of a 30 - 60 - 90 triangle is 11. what is the perimester
Pavlova-9 [17]

Since we know that the hypotenuse is 11 and this is a 30 - 60 - 90 right triangle we can use 11 to find the other sides.

The hypotenuse is 2s, s is the 30 side length.

So s = 11 / 2 = 5.5

The 60 side is s * square root of 3.

5.5 * square root of 3 = about 9.5.

Now that we know all three sides we can add them together to get the perimeter.

11 + 5.5 + 9.5 = 26

:)))

7 0
3 years ago
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