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3 years ago

Find the number of real number solutions for the equation. x2 + 9x + 20 = 0

Mathematics

1 answer:

fiasKO [112]3 years ago

6 0

$x^2 + 9x + 20 = 0 \\ x^2+4x+5x+20=0\\ x(x+4)+5(x+4)=0\\ (x+5)(x+4)=0\\ x=-5 \vee x=-4$

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The sales tax for an item was $9.40 and it cost $470 before tax. find the sales tax rate. write your answer as a percentage.

ankoles [38]

The sale tax would be the 2% of 470

5 0

3 years ago

Determine whether each equation has one solution, no solution, or infinite solutions.

Sati [7]

Answer:

a. has one solution

b. infinite solution

Step-by-step explanation:

2(x - 1) + 6 = 4x - 22

2x - 2 + 6 = 4x - 22

2x - 4x = 2 - 6 - 22

-2x = -26

x = 26/2

x = 13

6(2x + 1) – 2 = 12x + 4

12x + 6 - 2 = 12x + 4

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4 years ago

Whats the answer? HELP??

pishuonlain [190]

Answer:

<em> (1). 50.0° ; (2). 15.5 units</em>

Step-by-step explanation:

3 0

3 years ago

Read 2 more answers

I need help ASAP!!

Viktor [21]

Answer:

$\frac{64}{49}$

Step-by-step explanation:

As we can see the given expression as three complex parts and all are being multiplied.

Lets simplify each part separately and then multiply all of them in the end

Part1

$(\frac{8.4.2}{8.7})^{2}$

Cancelling 8 in numerator with 8 in denominator

$(\frac{4.2}{7})^{2}$

$(\frac{8}{7})^{2}$

$\frac{64}{49}$

Part2

$(\frac{8^{0} }{7^{-3} })^{3}$

simpliying

$(\frac{1}{7^{-3} })^{3}$

$({7^{3} })^{3}$

$7^{9}$

Part3

Third part is $7^{-9}$ , and it does not need to be further simplified

Now multiplying all the three parts

$\frac{64}{49}.7^{9}.7^{-9}$

$\frac{64}{49}.7^{9-9}$

$\frac{64}{49}.7^{0}$

$\frac{64}{49}.1$

$\frac{64}{49}$

So our final answer is $\frac{64}{49}$

5 0

3 years ago

I need help on number 6

sergeinik [125]

D is correct
3(2x-5)=6x+k
6x-15=6x+k
If 2 equations are identical the solution will be infinite

4 0

3 years ago