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3 years ago

What is the product of (x+3)(x+5)

Mathematics

2 answers:

11Alexandr11 [23.1K]3 years ago

6 0

Answer:

USE FOIL***** Inner outer and Center x^2 + 8x+ 15

Step-by-step explanation:

x times x is x^2

(3)(x) is 3x

(x)(5) is 5x

(3)(5) is 15

add like terms:

x^2 + 8x+ 15

Citrus2011 [14]3 years ago

5 0

Answer:

$x^{2}$ +8x+15

Step-by-step explanation:

we apply the distributive property

so we have

(x+3)*(x+5)

x*x+5*x+3*x+3*5

finally

we have

$x^{2}$ +8x+15

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oksano4ka [1.4K]

Answer:

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Step-by-step explanation:

Data given and notation

$\bar X=55.82$ represent the sample mean

$s=0.77$ represent the standard deviation for the sample

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$\alpha$ represent the significance level for the hypothesis test.

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Alternative hypothesis: $\mu < 56$

We don't know the population deviation, so for this case is better apply a t test to compare the actual mean to the reference value, and the statistic is given by:

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t-test: "Is used to compare group means. Is one of the most common tests and is used to determine if the mean is (higher, less or not equal) to an specified value".

Calculate the statistic

We can replace in formula (1) the info given like this:

$t=\frac{55.82-56}{\frac{0.77}{\sqrt{49}}}=-1.636$

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