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2 years ago

If using the method of completing the square to solve the quadratic equation

Mathematics

1 answer:

sertanlavr [38]2 years ago

4 0

Answer:

x=-1+\sqrt{15}i,\:x=-1-\sqrt{15}i

Step-by-step explanation:

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To convert 0.7 hours into minutes, which ratio could you multiply by? Remember that 1 hour = 60 minutes.

ira [324]

0.7hr(60min/hr)=42 min

The ration you multiplied by was 60min/hr, to cancel out the hr unit label...

3 0

2 years ago

A sample of 1800 computer chips revealed that 53% of the chips do not fail in the first 1000 hours of their use. The company's p

charle [14.2K]

Answer:

So the value of the test statistic is -0.85.

Step-by-step explanation:

We know that a sample of 1800 computer chips revealed that 53% of the chips do not fail in the first 1000 hours of their use. The company's promotional literature states that 54% of the chips do not fail in the first 1000 hours of their use.

We get that:

$n=1800\\\\p_1=53\%=0.53\\\\p_2=54\%=0.54\\$

We calculate the standar deviation:

$\sigma=\sqrt{\frac{0.53 \cdot (1-0.53)}{n}}=\sqrt{\frac{0.53 \cdot 0.47}{1800}}=0.01176$

We calculate the value of the test statistic:

$z=\frac{p_1-p_2}{\sigma}=\frac{0.53-0.54}{0.01176}=-0.85$

So the value of the test statistic is -0.85.

5 0

3 years ago

What is the simple interest on $360 borrowed for 30 months at 12.3%?

astra-53 [7]

Answer:

$110.70

Step-by-step explanation:

P (principal)=360

R(rate)=12.3%

T(time)=30 months (2 and half years)

I=360*12.3%*2.5

=$110.70

Just to note 12.3% is also 0.123 we sometimes change it into a decimal.

3 0

2 years ago

Read 2 more answers

What is the unit price for the cans of lemonade at each of the stores. The store prices are 3 for 9$

11Alexandr11 [23.1K]

9$ for three cans then 9/3= 3 $ per can

3 0

2 years ago

What is the length of ST?

defon

Answer:

5 cm

Step-by-step explanation:

Let's assume this is a number line were given.

Distance of S from 0 = 4 units

Distance of T from 0 = 9 units

Length of ST = the difference between T and S

ST = |9 - 4| = 5 units = 5 cm

This means S and T are 5 cm apart.

3 0

3 years ago