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3 years ago

X^2- 4x- 12 = 0 Solve by factoring and solve by completing the square

Mathematics

1 answer:

DiKsa [7]3 years ago

8 0

Use the formula (b/2)^2 in order to create a new term. Solve for by using this term to complete the square.

Cannot solve by completing the square.

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A circle has an area of 25pi Find the radius of the circle. A. 5 B. 10 C. 25

EastWind [94]

Answer:

A. 5

Step-by-step explanation:

Given the area of the circle is 25pi. We will divide by pi. Then, the radius of the circle is r= 5.

4 0

3 years ago

Read 2 more answers

You have just used the network planning model and found the critical path length is 30 days and the variance of the critical pat

ollegr [7]

Answer: The probability that the project will be completed in 33 days or less is equal to 0.73 .

Step-by-step explanation:

We assume that this is a normally distribution.

Given : The critical path length is 30 days .

i.e. Population mean = $\mu=30$

Variance : $\sigma^2=25$

Then, standard deviation : $\sigma=\sqrt{25}=5$

Z-score : $z=\dfrac{x-\mu}{\sigma}$

The value of z corresponding to 33 = $z=\dfrac{33-30}{5}=0.6$

Now, the p-value = $P(x\leq33)=P(z\leq0.6)=0.7257469\approx0.73$

Hence, the probability that the project will be completed in 33 days or less is equal to 0.73.

6 0

3 years ago

Read 2 more answers

2m-8-m+10 solve it.

Olin [163]

Answer:

m+2

Step-by-step explanation:

Collect like terms

m-8+10

Calculate the term

x+2

Hope this helpsʕ•ᴥ•ʔ

4 0

3 years ago

Armando spent $9.70 at the grocery store. he spent $2.95 on a bag of baby spinach and bought tomatoes at $2.25 per pound. How ma

Sever21 [200]

He bought 3 pounds of tomatoes

6 0

3 years ago

Find the surface area of a 7.4 cm long iron rod and 3.1 m radius

Debora [2.8K]

Answer:

144.2 cm

Step-by-step explanation:

Length of the iron rod is 7.4cm

Radius is 3.1m

Therefore the surface area can be calculated as follows

= 2πrl

= 2×3.142×3.1×7.4

= 144.2 I'm

Hence the surface area is 144.2cm

3 0

2 years ago

X^2- 4x- 12 = 0 Solve by factoring and solve by completing the square​

X^2- 4x- 12 = 0 Solve by factoring and solve by completing the square