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3 years ago

(-3+6)•2/2 evaluate the expression

Mathematics

2 answers:

ivann1987 [24]3 years ago

7 0

Answer:

-13

Step-by-step explanation:

I think this is right

EleoNora [17]3 years ago

6 0

$\huge \boxed{\mathbb{QUESTION} \downarrow}$

(-3+6)•2/2, evaluate the expression.

$\large \boxed{\mathfrak{Answer \: with \: Explanation} \downarrow}$

$\sf( - 3 + 6 ) \cdot \frac { 2 } { 2 } \\$

Divide 2 by 2 to get 1.

$\sf \: \left(-3+6\right)\times 1$

Add -3 and 6 to get 3.

$\sf \: 3\times 1$

Multiply 3 and 1 to get 3.

$= \boxed{\boxed{ \bf \: 3}}$

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Hello I don’t understand question 9 a and b. Please show working out.<br> Thanks

brilliants [131]

A) I would make the positive integer x and then form an equation.

x + 30 = x^2 - 12
x + 42 = x^2
0 = x^2 - x - 42 this can be factorised
(x - 7) ( x + 6) Therefore x = 7 or x = -6

Since the question asks for a positive integer the answer is 7.

B) two positive numbers x and y.

X - y = 3
x^2 + y^2 = 117

Use these simultaneous equations to figure out each number.

Rearrange the first equation

x = y + 3

Then substitute it into the second equation.

(y+3)^2 + y^2 = 117
y^2 + 6y + 9 + y^2 = 117
2y^2 + 6y - 108 = 0
then factorise this.
(2y - 12) (y + 9)

This means that y = 6 or y = -9 but it’s 6 because that’s the only positive number.

Use y to find x

x = y + 3
x = 6 + 3
x = 9

So the answers are x = 9 and y = 6.

3 0

3 years ago

Find the inverse function for f(x)=sqrt2x-6 picture below

Olenka [21]

Answer:

y = (x^2 + 6) / 2

Step-by-step explanation:

Original function: $\sqrt{2x - 6}$

To find the inverse of a function we have to switch the x and y values and solve for y again

x = sqrt (2y-6)

To get rid of a square root we square the square root so:

x^2 = 2y-6

Add 6

x^2 + 6 = 2y

Divide by 2

y = (x^2 + 6) / 2

6 0

3 years ago

Where are my smart friends?? I had $13.00. My Mom gave $10.00. My Dad gave $30.00. My Aunt, My Uncle and grandma gave me $100.00

ziro4ka [17]

Answer:

You have $360.

Step-by-step explanation:

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3 years ago

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What do you think is another example of when a person would need to use credit or borrow money?

NemiM [27]

Answer:

You need money for employees, equipment, office space and much more. Borrowing money to start your practice is often a good idea. The debt is being used to fund something that will likely generate healthy returns, allowing you to safely make the debt payments.

hope this helps :)

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3 years ago

The diameters of ball bearings are distributed normally. The mean diameter is 83 millimeters and the standard deviation is 3 mil

Alenkinab [10]

Answer:

0.2514 = 25.14% probability that the diameter of a selected bearing is greater than 85 millimeters.

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 question, we have that:

$\mu = 83, \sigma = 3$