Given f(x)= 20x+ 10, find f(3)

Mathematics

2 answers:

Korolek [52]4 years ago

7 0

Answer:

f(3) = 70

Step-by-step explanation:

f(x)= 20x+ 10

Let x= 3

f(3)= 20*3+ 10

f(3) = 60+10

=70

Pepsi [2]4 years ago

4 0

Answer: f(x) = 70

Step-by-step explanation:

f(x) = 20(3) + 10

f(x) = 60 + 10

f(x) = 70

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5 - 3(a + 6) = a - 1 + 8a

Westkost [7]

Answer:

$a = - 1$

Step-by-step explanation:

$5 - 3(a + 6) = a - 1 + 8a$

$5 - 3a - 18 = a - 1 + 8a$

rearrange like terms

$5 - 17 = 12a$

divide by coefficient of a

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8 0

4 years ago

The weekly salaries of teachers in one state are normally distributed with a mean of $490 and a standard deviation of $45. What

atroni [7]

Answer:

21.77% probability that a randomly selected teacher earns more than $525 a week

Step-by-step explanation:

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the zscore of a measure X is given by:

$Z = \frac{X - \mu}{\sigma}$

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

$\mu = 490, \sigma = 45$