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3 years ago

Evaluate : X + 2 ( x -20) (4) for x = 10

Mathematics

1 answer:

Oxana [17]3 years ago

6 0

Answer:

x + 2 ( x - 20 )( 4 ) = -70

Step-by-step explanation:

hope this helps. . .<3

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1. 4x=3y+3, 6y= 8x+ 36.

GaryK [48]

4x=3y+3 and 6y= 8x+ 36 and y=3x-1 and y= 6- x/3

4x=3y+3 and 6y= 8x are parallel and y=3x-1 and y= 6- x/3 are perpendicular.

See the attached plot for answer.

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4 years ago

The estimated regression equation is = 7.6 + .9x. what is the value of the standard error of the estimate (to 2 decimals)?

kupik [55]

Any answer things? :/

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3 years ago

Do the law of order and the law of grouping apply to subtraction?

emmasim [6.3K]

Since we know that law of order states that sum or product of any two specific numbers will be same irrespective to their order. $a+b=b+a$ and $a*b=b*a$ .

Law of order is only applicable for addition and multiplication. It is not applicable to subtraction and division. Let us see it by an example.

$50-25\neq25-50$

$25\neq-25$

Law of grouping states that it does not matter how to order a group of numbers while adding or multiplying. $a+(b+c)=(a+b)+c$ and $a*(b*c)=(a*b)*c$ .

Law of grouping is not applicable to subtraction and division. Let us see it by an example.

$15-(5-3)\neq(15-5)-3$

$15-(2)\neq(10)-3$

$13\neq7$

Therefore, we can see that law of order and law of grouping is not applicable to subtraction.

3 0

3 years ago

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Two parallel lines are crossed by a transversal. What is the value of x? x = 21 x = 28 x = 35 x = 37

DENIUS [597]

Using the definition of vertical angles you can set up the equation 3x+4=115, when solved you get x=37. Hope this helps!

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3 years ago

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Use the following pattern to answer the questions. 24.3, 24, 23.7, 23.4, ___,____. part A. ( what is the rule for the pattern?

vodka [1.7K]

Question 1:

For this case we have the following pattern of numbers:

24.3, 24, 23.7, 23.4

It can be seen that subtracting 0.3 from the first number of the pattern gives $24.3-0.3 = 24\\$

Equally if we subtract 0.3 successively we obtain:

$24-0.3 = 23.7\\\\23.7-0.3 = 23.4\\\\23.4-0.3 = 23.1\\\\23.1-0.3 = 22.8\\$

Thus, 0.3 must be subtracted from each term and the following numbers of the pattern shall be 23.1 and 22.8

Answer:

subtract 0.3 from each term

The next two numbers of the pattern are 23.1 and 22.8

Question 2:

For this case we have the following operation:

$0.52 + 0.61 = 1.13\\\\1.13> 1\\$

We note that the sum is greater than 1

The sum of two hundredth decimals does not necessarily have to be greater than 1.

Therefore, the correct option is: the sum is greater than 1 because the sum shades more than one hundredths grid.

Answer:

Option C

Question 3:

For this case we have to:

$a + b + c = 2\\$

Being a, b, c decimal numbers, one of them was 0.34. Suppose $a = 0.34\\$

Thus: $0.34 + b + c = 2\\$

We choose values for b and c, in order to obtain the number 2 as a result of the sum. We can choose infinite values so that equality is fulfilled

If $b = 0.96$ and

$c = 0.7\\$

we have: $0.34 + 0.96 + 0.7 = 2\\$

Thus, Holland can add to the sum $b = 0.96$ and $c = 0.7\\$

Answer:

$b = 0.96\\\\c = 0.7\\$

Question 4:

For this case we have the following subtraction:

$3.5 - 2.46 = 1.16\\$

This operation is wrong, subtracting $3.5-2.46$ results in 1.04

Let's explain a model for Maysa:

We have the following expression

$3.5 - 2.46\\$

Rewriting each number in expanded form we have:

$(3 + 0.5) - (2 + 0.46)\\$

Using the distributive property we have:

$(3 + 0.5) -2-0.46\\$

Using the associative property we have:

$(3-2) + (0.5-0.46)\\$

Performing each operation:

$1 + 0.04 = 1.04\\$

Anwer:

The subtraction of Maysa is wrong, the correct answer is:

$3.5 - 2.46 = 1.04$

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3 years ago

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