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3 years ago

Please help -33=3(x-9) whats x?

Mathematics

1 answer:

Dominik [7]3 years ago

5 0

Answer:

x=-2

Step-by-step explanation:

First you divide both -33 and 3 by 3, should have -11=(x-9) afterwards. Then you want to Move the x to the right side of the equal sign and the -11 to the left of the equal sign. Should look like this: x=9-11. Then subtract and get -2.

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How to check that a number is divisible by 3 or not?? Need a best shortcut!!

Lilit [14]

If your number is quite large, like 3 digit or higher than that, then calculate the sum of their digits, if they will be divisible by 3, then the number is divisible, otherwise not.

For example. - "11055"
Here, sum of digits = 1 + 1 + 0 + 5 + 5 = 12
As 12/3 = 4 (Divisible)

In short, This number would be divisible.

Hope this helps!

5 0

4 years ago

Read 2 more answers

Help help help I'll mark u BRAINLIEST SOLVE:3x² +5x−2≤0

MissTica

Answer:

-2 <= x <= 1/3

Step-by-step explanation:

it is the same as for equations.

the solution for a square equation is

x = (-b ± sqrt(b² - 4ac))/(2a)

our parameters here are

a = 3

b = 5

c = -2

so,

x = (-5 ± sqrt(25 - -24))/6 = (-5 ± sqrt(49))/6 = (-5 ± 7)/6

x1 = (-5 + 7)/6 = 2/6 = 1/3

x2 = (-5 - 7)/6 = -12/6 = -2

since we are looking for smaller or equal, points of 0 will be part of the solution.

now we need to check each side of these points on the x-axis, if they are true or not to the inequality.

left of -2 : let's pick -3

3×(-3)² + 5×-3 -2 = 3×9 - 15 - 2 = 27 - 15 -2 = 10

this is NOT <= 0, so this interval does not fit.

similar, right of 1/3 : let's pick 1

3×1² + 5×1 - 2 = 3 + 5 - 2 = 6

this is NOT <= 0, so this interval does not fit either (as expected, as normally either both sides fit, or both fail).

lastly, in the middle between -2 and 1/3 : let's pick 0

3×0² + 5×0 - 2 = -2

this IS <= 0, so the interval between -2 and 1/3 fits.

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3 years ago

Which of the following is an example of dependent events?

Westkost [7]

Answer:

Step-by-step explanation:

drawing from a sample space without replacement is a dependent event. subsequent draws depends on the result of previous draws

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4 years ago

Mike walked 3 miles in 45 minutes. What was his rate in miles per hour? A 1/4 miles per hourB 2 1/4 miles per hour C 4 miles per

Lemur [1.5K]

Answer:

4 miles per hour

Step-by-step explanation:

I took it on k-12

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2 years ago

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Analyze the reflectional symmetry of the regular polygons. The square has -fold reflectional symmetry. The regular octagon has -

postnew [5]

Answer:

The square has 4-fold reflectional symmetry. The regular octagon has 8-fold symmetry.

Step-by-step explanation:

For a square,

There are two lines of symmetry along two diagonals and

two lines of symmetry along midpoints of two pairs of opposite sides.

Therefore, there are 4 lines of reflectional symmetry in total.

For a regular octagon,

There are four lines of symmetry along four diagonals and

four lines of symmetry along midpoints of four pairs of opposite sides.

Therefore, there are 8 lines of reflectional symmetry in total.

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3 years ago