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yarga [219]
3 years ago
15

Which expression is equivalent to r9•r3

Mathematics
1 answer:
evablogger [386]3 years ago
6 0

Answer:

An equivalent expression to this equation is r¹²

Step-by-step explanation:

When multiplying exponents, you add the exponential numbers together. So, you would add 9 and 3 together.

r⁹ × r³ = r¹²

So, an expression that is equivalent to the equation is <em>r¹²</em>

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3 years ago
Reverse the two digits of my age, divide by three, add 20, and the result is my age. How many years old am I
lapo4ka [179]

Answer:

  • 48 years old.

Step-by-step explanation:

Let the age be xy or 10x + y.

Reverse the two digits of my age, divide by three, add 20, and the result is my age, convert this to equation:

  • (10y + x)/3 + 20 = 10x + y
  • (10y + x)/3 = 10x + y - 20
  • 10y + x = 3(10x + y - 20)
  • 10y + x = 30x + 3y - 60
  • 30x - x + 3y - 10y = 60
  • 29x - 7y = 60

We should consider both x and y are between 1 and 9 since both the age and its reverse are 2-digit numbers.

Possible options for x are:

  • 29x ≥ 7*1 + 60 = 67 ⇒ x > 2, at minimum value of y,

and

  • 29x ≤ 7*9 + 60 = 123 ⇒ x < 5, at maximum value of y.

So x can be 3 or 4.

<h3>If x = 3</h3>

  • 29*3 - 7y = 60
  • 87 - 7y = 60
  • 7y = 27
  • y = 27/7, discarded as fraction.

<h3>If x = 4</h3>

  • 29*4 - 7y = 60
  • 116 - 7y = 60
  • 7y = 56
  • y = 8

So the age is 48.

6 0
1 year ago
Jerome solved the equation below by graphing. log Subscript 2 Baseline x + log Subscript 2 Baseline (x minus 2) = 3 Which of the
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Answer:

Step-by-step explanation:

This question is too difficult

5 0
3 years ago
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5x+6.5=8x-2.5 what does this mean and i would like to know how to solve this equation
Bingel [31]

The answer is x = 3

I hope this helped

6 0
3 years ago
PLEASEEE HELP -7a + 2b
Y_Kistochka [10]

Answer:

There are no like terms.

so its -7a+2b

Step-by-step explanation:

5 0
2 years ago
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