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3 years ago

Which of the following are solutions to the equation below? check all that apply x^2+4x-9=x+1

Mathematics

1 answer:

Aleks04 [339]3 years ago

6 0

The answer is C and D only

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A local park is building a sand volleyball court 40 feet long and 15 feet wide. They are paying $3000 to have the sand put into

andrew-mc [135]

Answer:

The court cost $5 per square foot of sand

Step-by-step explanation:

step 1

Find the area of the volleyball court

The area of the rectangular court is equal to

$A=LW$

we have

$L=40\ ft$

$W=15\ ft$

substitute

$A=(40)(15)=600\ ft^{2}$

step 2

Divide the total cost to have the sand put into the court by the area of the court

$\frac{3,000}{600}\frac{\$}{ft^{2}}=5\frac{\$}{ft^{2}}$

therefore

The court cost $5 per square foot of sand

4 0

3 years ago

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The middle one, i need help. i’m at a 71 in math. please?

o-na [289]

Answer:

The answer is D. 33C.

Step-by-step explanation:

The highest temperature is given to be 23 degree above Celsius.

The lowest temperature is given to be 10 degree below Celsius.

The difference between the two = 23 - (-10)

= 23 + 10

= 33 degree C

6 0

3 years ago

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Among 320 randomly selected airline travelers, the mean number of hours spent travelling per year is 24 hours and the standard d

Ostrovityanka [42]

The margin of error of the random selection is 0.29

The given parameters are:

$n = 320$ --- the sample size

$\sigma = 2.9$ --- the standard deviation

$\bar x = 24$ --- the mean

$\alpha = 90\%$ --- the confidence level.

The margin of error (E) is calculated as follows:

$E = z \times \sqrt{\frac{\sigma^2}{n}}$

So, we have:

$E = z \times \sqrt{\frac{3.2^2}{320}}$

$E = z \times \sqrt{\frac{10.24}{320}}$

The z-value for 90% confidence level is 1.645.

Substitute 1.645 for z

$E = 1.645 \times \sqrt{\frac{10.24}{320}}$

$E = 1.645 \times \sqrt{0.032}$

Take square roots

$E = 1.645 \times 0.1789$

Multiply

$E = 0.2943$

Approximate

$E = 0.29$

Hence, the margin of error is 0.29

Read more about margin of error at:

brainly.com/question/14396648

5 0

2 years ago

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Prove the identity with steps.

Sav [38]

Remember that a double angle formula for cosine is
$\cos(2x)=\cos^{2}x-\sin^{2}x$

So
$\cos^{2}(2x)-\sin^{2}(2x)=\cos(4x)$
$\rightarrow \cos^{2}(2x)-\sin^{2}(2x)=\cos(2*2x)$
$\rightarrow \cos^{2}(2x)-\sin^{2}(2x)=\cos^{2}(2x)-\sin^{2}(2x)$

4 0

3 years ago

Find the prime factorization of 72.

barxatty [35]

Answer:

2^3×3^2

and yh

Step-by-step explanation:

2×2×2×3×3

5 0

3 years ago

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