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rosijanka [135]
3 years ago
13

Find the solution set 7x^2-9x-10=0

Mathematics
2 answers:
Novay_Z [31]3 years ago
7 0

Answer:

x = -5/7 or x = 2

Step-by-step explanation:

7x² - 9x - 10 = 0

Factor the left side of the equation.

(7x + 5) (x - 2) = 0

Set the factors equal to 0.

7x + 5 =0

7x = -5

x = -5/7

x - 2 = 0

x = 2

vitfil [10]3 years ago
5 0

Answer:

x = -5/7, 2

Step-by-step explanation:

Step 1: Factor

(5x + 7)(x - 2) = 0

Step 2: Find <em>x </em>roots

5x + 7 = 0

x = -5/7

x - 2 = 0

x = 2

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Ineed help help me please
melamori03 [73]
The symbol ₁₂P₉ represents the permutations of 9  quantities out of 12.
By definition,
_{12}P_{9} =  \frac{12!}{(12-9)!} = \frac{12!}{3!}

From the calculator,
12! = 479,001,600
3! = 6

Therefore
₁₂P₉ = 479001600/6 = 79,833,600

Answer: 79,833,600
8 0
3 years ago
Cara is 5'6" tall and her husband Jack is<br> 6'2" tall. Find the difference in their heights.
defon

Answer:

6"

Step-by-step explanation:

6'2" - 5'6" = 0'6"

4 0
3 years ago
What is the sum of 5 feet 9 inches and 12 feet 3 inches
mestny [16]
5 ft + 12 ft = 17 ft 

<span>9 in + 3 in = 12 in = 1 ft </span>

<span>17 ft + 1 ft = 18 ft
</span>hope this helps
6 0
2 years ago
Read 2 more answers
The sum of two numbers is 39. Their difference is 21. What are the two numbers?
mrs_skeptik [129]

Answer:

30 and 9

Step-by-step explanation:

x+y=39 , x-y=21

Solve for x:

x+y=39 , x-y=21

x= 30

Substitute x with 30:

(30)+y=39 , (30)-y=21

Solve for y:

y=9

4 0
3 years ago
Read 2 more answers
How many ways can 6 people be chosen and arranged in straight line if there are 8 people to choose from? a. 48.b. 720.c. 20, 160
Ipatiy [6.2K]

Answer:

<h2>C. <em>20,160</em></h2>

Step-by-step explanation:

This question bothers on permutation since we are to select a some people out of a group of people and then arrange in a straight line. If r object are to be arranged in a straight line when selecting them from n pool of objects. This can be done in nPr number of ways.

nPr = n!/(n-r)!

Selection of 6 people out of 8 people can therefore be done in 8C6 number of ways.

8P6 = 8!/(8-6)!

8P6 = 8!/2!

8P6 = 8*7*6*5*4*3*2!/2!

8P6 = 8*7*6*5*4*3

8P6 = 56*360

8P6 = 20,160

<em>Hence this can be done in 20,160 number of ways</em>

5 0
3 years ago
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