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Aleonysh [2.5K]
3 years ago
9

Mathematics sat question

Mathematics
2 answers:
Tanzania [10]3 years ago
6 0

Answer:

A) a^2 + a

Step-by-step explanation:

So the problem says "sum" which means you have to add the expressions

(a^2) - 1 and a+1

Work:

((a^2) - 1) + (a + 1)

We can simplify only the constants

(a^2) + a + 1 - 1

(a^2) + a

so the answer is A

navik [9.2K]3 years ago
5 0

Answer: A) a^{2} + a

add the two equations together to get A.

the ones cancel eachother out and you cant add a^{2} to a

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The average rate is the number of equations divided by the time to do them.

The number of equations is the rate multiplied by the time.

On Monday, the number of equations is
.. number = rate*time = P*3
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3 years ago
5(x+6)+11=25-3x what is the answer?
Zolol [24]
This is how I did it:
5(x + 6) + 11 = 25 - 3x          use distribution
5x + 30 + 11 = 25 - 3x          use addition
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3 0
3 years ago
Find ratio of 13cm : 65m​
vesna_86 [32]

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1:5

Step-by-step explanation:

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6 0
3 years ago
In Pennsylvania the average IQ score is 101.5 The variable is normally distributed and the population standard deviation is know
elena-14-01-66 [18.8K]

Answer:

P-value = 0.0368

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(right) 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 } = 1.64

Since,  

z_{stat} > z_{critical}

We reject the null hypothesis and accept the alternate hypothesis. Thus, students in Pennsylvania have an IQ that is significantly greater than the state average.

P-value can be calculated with the standard normal table.

P-value = 0.0368

P-value is lower than the significance level.

4 0
3 years ago
Which unit would you use to measure the amount of milk in a half-gallon carton?
Jlenok [28]
You would use L to measure the amount
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