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3 years ago

How do I solve 2-(-4) +3+(-6)-(-2)

Mathematics

2 answers:

vazorg [7]3 years ago

8 0

Answer:

5 maybe

Step-by-step explanation:

2-(-4)+3+(-6)-(-2)

2+4+3-6+2

aalyn [17]3 years ago

5 0

Answer:

Step-by-step explanation:

2-(-4)+3+(-6)-(-2)

2+4+3-6+2

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The population of bacteria in a culture doubles every 14 hours. How long will it take for

Snezhnost [94]

Answer: 22 hours 11 minutes

<u>Step-by-step explanation:</u>

$P=P_o\cdot e^{(kt)}\\\\\text{Since the initial population is doubled in 14 hours, then:}\\2P_o=P_o\cdot e^{k\cdot 14}\\2=e^{14k}\\ln\ 2=ln\ e^{14k}\\ln\ 2=14k\\\\\dfrac{ln\ 2}{14}=k\\\\0.0495=k\\\\\\\text{Now that the k-value has been determined, we can find the time when the}\\\text{population is tripled:}\\3P_o=P_o\cdot e^{0.0495t}\\3=e^{0.0495t}\\ln\ 3=ln\ e^{0.0495t}\\ln\ 3=0.0495t\\\\\dfrac{ln\ 3}{0.0495}=5\\\\22.19=t\\\\22\ hrs +0.19\ hrs$

$22\ hours + \bigg[\dfrac{19}{100}=\dfrac{x}{60}\bigg]\\\\22\ hours + 11\ minutes$

4 0

3 years ago

Suppose that the speeds of cars travelling on California freeways are normally distributed with a mean of miles/hour. The highwa

Readme [11.4K]

Answer:

the standard deviation of the speeds of cars travelling on California freeways is 6.0 miles per hour

Step-by-step explanation:

The computation of the standard deviation of the speeds of cars is shown below;

The z score for the top 1% is 2.326

So,

= (75 - 61) ÷ standard deviation = 2.326

Standard deviation is

= 14 ÷ 2.326

= 6.0 miles per hour

Hence, the standard deviation of the speeds of cars travelling on California freeways is 6.0 miles per hour

4 0

3 years ago

Using a deck of 52 playing cards, what are the odds in favor of drawing a Jack or 10?

andrey2020 [161]

odds against drawing a Jack are 48:4
odds in favor of drawing a Jack are: 4:48

3 0

3 years ago

What is the equation of the parabola with focus (1,1/2) and directrix y=3

IgorC [24]

Answer: A

Explanation:

7 0

3 years ago

A consumer organization inspecting new cars found that many had appearance defects. While none had more than 3 defects, 7% had t

AlexFokin [52]

Answer:

E(X) = 0.64

Sd(X) = 0.933

Step-by-step explanation:

3(0.07) + 2(0.11) + 1(0.21)

E(X²) = 3²(0.07) + 2²(0.11) + 1²(0.21)

= 1.28

Var(X) = 1.28 - 0.64² = 0.8704

Sd = 0.933

7 0

3 years ago