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3 years ago

Adding Monomials: Need some Help please ?

Mathematics

1 answer:

AleksAgata [21]3 years ago

4 0

Just add the numbers if the letters are the same only I multiplying do you add the exponents

Answer 14 b^5

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in a metal alloy, the ratio of zinc to copper is 3 to 17. If there are 510 lb of copper, how much zinc is there?

Andreyy89

Answer:

Step-by-step explanation:

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3 years ago

Mind giving me a hand?

zaharov [31]

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3 years ago

In Pennsylvania the average IQ score is 101.5. The variable is normally distributed, and the population standard deviation is 15

blsea [12.9K]

Answer:

We conclude that the Pennsylvania school district have an IQ higher than the average of 101.5

Step-by-step explanation:

We are given the following in the question:

Population mean, μ = 101.5

Sample mean, $\bar{x}$ = 106.4

Sample size, n = 30

Alpha, α = 0.05

Population standard deviation, σ = 15

First, we design the null and the alternate hypothesis

$H_{0}: \mu = 101.5\\H_A: \mu > 101.5$

We use one-tailed z test to perform this hypothesis.

Formula:

$z_{stat} = \displaystyle\frac{\bar{x} - \mu}{\frac{\sigma}{\sqrt{n}} }$

Putting all the values, we have

$z_{stat} = \displaystyle\frac{106.4 - 101.5}{\frac{15}{\sqrt{30}} } = 1.789$

Now, $z_{critical} \text{ at 0.05 level of significance } = 1.96$

Since,

$z_{stat} > z_{critical}$

We reject the null hypothesis and accept the alternate hypothesis.

Thus, we conclude that the Pennsylvania school district have an IQ higher than the average of 101.5

5 0

3 years ago

Please help I will mark brainly!!!!

kondaur [170]

2,5,8,11,14 because it’s going by 3’s.

5 0

3 years ago

Read 2 more answers

When the sugar bowl is full it’s weight 750 g how many tablespoons of sugar can the bowl hold

grandymaker [24]

Answer:

50 tbsp

Step-by-step explanation:

3 0

3 years ago