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3 years ago

What is 1 times 3 plus 4 divided by 2?? please help me

Mathematics

2 answers:

Nataly [62]3 years ago

6 0

Answer:

3.5

Step-by-step explanation:

the answer is 3.5, not 5 don't let the "calculator" trick you

Montano1993 [528]3 years ago

3 0

the anwenser is 3.5 hope this helped :}

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How can i ➗ 15 by 42

VladimirAG [237]

Answer:2.8

Step-by-step explanation: 42/15

6 0

4 years ago

How do we find the missing side of a shape when we are given the perimeter?

ryzh [129]

Answer:

subtract the inside number's

Step-by-step explanation:

first you add the inside numbers and then once you get that number lets to say you got 66, 66 times 66=4,356 then thats your number

4 0

4 years ago

True or false <br><br> (Picture provided)

aksik [14]

<h2>Answer:</h2><h3>False</h3><h2>Step-by-step explanation:</h2>

Let's find the inverse function of $f(x)=(x-3)^3+4$ to know whether this function has an inverse function $f^{-1}(x)=-3+\sqrt[3]{x+4}$ . So let's apply this steps:

a) Use the Horizontal Line Test to decide whether $f$ has an inverse function.

Given that f(x) is a cubic function there is no any horizontal line that intersects the graph of $f$ at more than one point. Thus, the function is one-to-one and has an inverse function.

b) Replace $f(x)$ by $y$ in the equation for $f(x)$ .

$y=(x-3)^3+4$

c) Interchange the roles of $x$ and $y$ and solve for $y$

$x=(y-3)^3+4 \\ \\ \therefore x-4=(y-3)^3 \\ \\ \therefore (y-3)^3=x-4 \\ \\ \therefore y-3=\sqrt[3]{x-4} \\ \\ \therefore y=\sqrt[3]{x-4}+3$

d) Replace $y$ by $f^{-1}(x)$ in the new equation.

$f^{-1}(x)=\sqrt[3]{x-4}+3$

So this is in fact the inverse function and it isn't the same given function. Therefore, the statement is false

3 0

4 years ago

Read 2 more answers

Write in intercept form

Alex787 [66]

-x² - x + 6

First thing I would do is distribute out that negative. Your new problem is:

- (x² + x - 6)

Now, factor the inside. We need to find products of - 6 that when added together have a sum of positive 1. They are 3 and - 2.

- (x² + 3x - 2x - 6)

Group together and find your factors. I'm going to short cut and go right to them for the sake of space and time.

- (x + 3)(x - 2)

Your answer is Option B

7 0

4 years ago

Suppose that diameters of a new species of apple have a bell-shaped distribution with a mean of 7.42cm and a standard deviation

mina [271]

Answer:

68% of the diameters are between 7.06 cm and 7.78 cm

Step-by-step explanation:

Mean diameter = μ = 7.42

Standard Deviation = σ = 0.36

We have to find what percentage of diameters will be between 7.06 cm and 7.78 cm. According to the empirical rule, for a bell-shaped data:

68% of the values are within 1 standard deviation of the mean. i.e. between μ - 1σ and μ + 1σ
95% of the values are within 2 standard deviations of the mean. i.e. between μ - 2σ and μ + 2σ
99.7% of the values are within 3 standard deviation of the mean. i.e. between μ - 3σ and μ + 3σ

So, we first need to find how many standard deviations away are the given two data points. This can be done by converting them to z-score. A z score tells us that how far is a data value from the mean. The formula to calculate the z-score is:

$z=\frac{x-\mu}{\sigma}$

x = 7.06 converted to z score will be:

$z=\frac{7.06-7.42}{0.36}=-1$

x = 7.78 converted to z score will be:

$z=\frac{7.78-7.42}{0.36}=1$

This means the two given values are 1 standard deviation away from the mean and we have to find what percentage of values are within 1 standard deviation of the mean.

From the first listed point of empirical formula, we can say that 68% of the data values lie within 1 standard deviation of the mean. Therefore, 68% of the diameters are between 7.06 cm and 7.78 cm

6 0

3 years ago