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Yuliya22 [10]
3 years ago
15

What is the answer to 3 (x + 7) =

Mathematics
2 answers:
Alexandra [31]3 years ago
6 0
Divide by 3 on both sides
x+7=3
subtract 7 from both sides
x=-7/3

or something
Masja [62]3 years ago
6 0
Distribute the 3 to x and 7.
3x+21

If you solve for x then you would subtract the 21 and move it to the other side of the equal sign 
3x=-21
Divide by 3
x=-7
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Find the sum: (3x2 + 5x − 8) + (5x2 − 13x − 5)
musickatia [10]

Answer:

(3x^2+5x-8)+(5x^2-13x-5)=8x^2-8x-13

Step-by-step explanation:

The given polynomials are,

3x^2+5x-8,5x^2-13x-5

In polynomial addition and subtraction only like terms can be added or subtracted.

So,

=(3x^2+5x-8)+(5x^2-13x-5)

=3x^2+5x-8+5x^2-13x-5

=3x^2+5x^2+5x-13x-8-5

=8x^2-8x-13

7 0
2 years ago
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Ok, so first convert both the numbers to improper fractions. (Multiply the denominator of the fraction by the whole number and add the numerator of the fraction)

Then keep the first number the same, change the division symbol to a multiplication symbol and use the reciprocal of the second number. (flip the numbers so that the denominator becomes the numerator and the numerator becomes the denominator.)

Then simply multiply across.
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The price of a technology stock has dropped to $9.71 today. Yesterday's price was $9.80. Find the percentage decrease.
Vadim26 [7]

Answer:

The percentage decrease = 0.9%

Step-by-step explanation:

  • Initial value = $9.80
  • Final value = $9.71

Using the formula

Percentage Decrease = [ (Initial Value - Final Value) / |Initial Value| ] × 100

                                    = [(9.80 - 9.71 ) / (9.80)] × 100

                                    = [0.09 / 9.80] × 100

                                    = 0.009 × 100  

                                    = 0.9%

Therefore, the percentage decrease = 0.9%

4 0
2 years ago
The waiting time to ride a roller coaster is 20 minutes when 150 people are in line. How long is the waiting time when 240 peopl
laiz [17]

Answer: The waiting time will be 32 minutes when 240 people in line.

Step-by-step explanation:

Let us assume that the waiting time is directly proportional to the number of people in the queue.

Equation of direct proportion between variables x and y :  \dfrac{x_1}{y_1}=\dfrac{x_2}{y_2}

Put x_1=20,\ y_1=150,\ y_2=150  to find  x_2.

\dfrac{20}{150}=\dfrac{x_2}{240}\\\\\Rightarrow\ x_2=\dfrac{20}{150}\times240\\\\\Rightarrow\ x_2=32

Hence, the waiting time will be 32 minutes when 240 people in line.

3 0
2 years ago
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