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2 years ago

14

The second term of an arithmetic sequence is 7, the sum of the first four terms in the arithmetic sequence is 12, find the first

term and the common difference

1 answer:

Montano1993 [528]2 years ago

3 0

Consider the following short explanation.
Answer: a1=15; d= -8.

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1. How can you tell that a point on the graph is a maximum or minimum?

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2 years ago

Four more than twice Kai’s age does not equal Kara’s age. If Kara is 15 years old, find Kai’s age. Let k = Kai's age.

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2 years ago

Read 2 more answers

Speeding: On a stretch of Interstate-89, car speed is a normally distributed variable with a mean of 69.1 mph and a standard dev

Alborosie

Answer: 11.9%

Step-by-step explanation:

Given : On a stretch of Interstate-89, car speed is a normally distributed variable with $\mu=69.1$ mph and $\sigma=3.3$ mph.

Let x be a random variable that represents the car speed.

Since , $z=\dfrac{x-\mu}{\sigma}$

z-score corresponds x = 73 , $z=\dfrac{73-69.1}{3.3}\approx1.18$

Required probability :

$\text{P-value }: P(x>73)=P(z>1.18)\\\\=1-P(z$

[using z-value table.]

Hence, the approximate percentage of cars are traveling faster than you = 11.9%

8 0

3 years ago