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masya89 [10]
3 years ago
12

What does this equal -12 = -3x -9

Mathematics
2 answers:
Mrrafil [7]3 years ago
7 0
X would equal 1
-12 = -3x -9
-3 = -3x
x = 1
Lorico [155]3 years ago
3 0
The answer to this is: x=1
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1. A store manager marked up the price of a $12 clock by 20%. What is the new price of the clock?
Anon25 [30]

Answer:

1) new price of the clock is $14.4

2) Kyra scored 70% marks

3) 43.75% students are not eighth graders

Step-by-step explanation:

1. A store manager marked up the price of a $12 clock by 20%. What is the new price of the clock?

Price of Clock = $12

Mark up = 20%

We need to find new price of clock.

The price of  clock can be found by finding 20% of 12 and then adding that amount in original price.

So, finding 20% of 12

20\% of 12 \\=\frac{20}{100}\times 12\\=2.4

So 20% of 12 is 2.4

Now finding new price:

New Price = Actual Price + Mark up

New Price = 12 + 2.4

New Price = 14.4

So, new price of the clock is $14.4

2. On a math quiz, Kyra answered 7 of 10 questions correctly. Express her quiz score as a percent.

Total questions = 10

Correct answers = 7

We need to express her quiz score as percent

It can be found using formula: Percent Score = \frac{Obtained\:Marks}{Total\:Marks}\times 100\%\\

Putting values and finding percentage

Percentage = \frac{Obtained\:Marks}{Total\:Marks}\times 100\%\\\\Percentage = \frac{7}{10}\times 100\%\\Percentage = 70\%

So, Kyra scored 70% marks

3. 96 students are enrolled in the Dance Program at Castillero. Of those students, 54 are eighth-graders. The remaining students are 6th or 7th graders. What percentage of the students are not eighth graders?

Total Students = 96

Number of eighth-graders students = 54

Remaining students = 96 - 54 = 42

So, 42 students are 6th or 7th graders

We need to find percentage of the students are not eighth graders.

\frac{42}{96}\times 100\%\\=43.75\%

So, 43.75% students are not eighth graders

4 0
3 years ago
What is the product of this following expression (3x +6)`2
grin007 [14]
Hi

(3x + 6)²
(3x + 6)(3x +6)
Distribute
(3x)(3x)+(3x)(6)+(6)(3x)+(6)(6)
9x² + 18x + 18x + 36
9x² + 36x + 36


A+ guaranteed!!!  

5 0
3 years ago
Read 2 more answers
What are the zeros of the quadratic function f(x) = 2x2 + 8x – 3?
jenyasd209 [6]

Answer:

  x=-2-\sqrt{\dfrac{11}{2}}\ \text{and}\ x=-2+\sqrt{\dfrac{11}{2}}

Step-by-step explanation:

My favorite way to go at this is to look at a graph. It shows the vertex at (-2, -11). Since the leading coefficient is 2, this means the roots are ...

  -2\pm\sqrt{\dfrac{11}{2}}

where the 2 in the denominator of the radical is the leading coefficient.

__

You can also use other clues:

  • the axis of symmetry is -b/(2a) = -8/(2(2)) = -2, so answer choices C and D don't work
  • the single change in sign in the coefficients (+ + -) tells you there is one positive real root, so answer choice B doesn't work.

The first answer choice is the only one with values symmetrical about -2 and one of them positive.

__

You may be expected to use the quadratic formula:

  x=\dfrac{-b\pm\sqrt{b^-4ac}}{2a}=\dfrac{-8\pm\sqrt{8^2-4(2)(-3)}}{2(2)}\\\\=\dfrac{-8}{4}\pm\dfrac{\sqrt{88}}{4}=-2\pm\sqrt{\dfrac{11}{2}}

7 0
3 years ago
How many centimeters are in 20 miles
sesenic [268]

Answer:3218680

cms

Step-by-step explanation: multiply 20x160934

3 0
3 years ago
Which terms are like terms in the following expression?
Reil [10]

Answer:

9x and -4x

This is the answer

8 0
3 years ago
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