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3 years ago

10

If 9 (x) = – 5x2 – 4x + 19 find f (–3)

1 answer:

Sliva [168]3 years ago

7 0

Answer:

- 14

Step-by-step explanation:

$f(x) = - 5 {x}^{2} - 4x + 19 \\ plug \: x = - 3 \\ f( - 3) = - 5 {( - 3)}^{2} - 4( - 3) + 19 \\ f( - 3) = - 5 \times 9 + 12 + 19 \\ f( - 3) = - 45 + 31 \\ f( - 3) = -14$

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2 years ago

Assume the hold time of callers to a cable company is normally distributed with a mean of 5.5 minutes and a standard deviation o

Ierofanga [76]

Answer:

The percent of callers are 37.21 who are on hold.

Step-by-step explanation:

Given:

A normally distributed data.

Mean of the data, $\mu$ = 5.5 mins

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We have to find the callers percentage who are on hold between 5.4 and 5.8 mins.

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⇒ Plugging the values.

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⇒ $0.3721\times 100$

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