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Rufina [12.5K]
3 years ago
13

What best describes how to evaluate a variable expression?

Mathematics
1 answer:
Kaylis [27]3 years ago
7 0
<span> To replace each letter with its value, and then finish it by doing the order of the operation/ solve it.</span>
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Solve the following logarithmic equation<br> x= log4 20
lara31 [8.8K]

Answer:

2.161 to the nearest thousandth.

Step-by-step explanation:

x = log4 20

By the definition of a logarithm:

20 = 4^x

ln 20 = x ln 4

x = ln20 / ln 4

x = 2.161 to the nearest thousandth.

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Solve for y.<br><br> 7y - 14 = 35
Radda [10]

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Step-by-step explanation:

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Select all of the equations that have x = 7 as a solution.
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Step-by-step explanation:

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What is the standard form for 25x²+4y²+50x-24y-39=0
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25x² + 4y² + 50x - 24y - 39 = 0
25x² + 50x + 4y² - 24y - 39 = 0
25x² + 50x - 39 = 0                                                      4y² - 24y - 39 = 0
x = <u>-b + √b² - 4ac</u>                                                        y<u> </u>= <u>-b + √b² - 4ac</u>
              2a                                                                              2a
x = <u>-50 + √(-50)² - 4(25)(-39)</u>                                        y =<u> -(-24) + √-(-24)² - 4(4)(-39)</u>
                 2(25)                                                                              2(4)
x = <u>-50 + √2500 + 3900</u>                                                y = <u>24 + √-576 + 624</u>
                   50                                                                                  8
x = <u>-50 + √6400</u>                                                            y =<u> 24 + √48
</u>            50                                                                                   8
x = <u>-50 + 80 </u>                                                                 y =<u> 24 + √16 × 3</u>
           50                                                                                          8
x = <u>-50 + 80</u>                                                                  y = <u>24 + √16 √3
</u>           50<u> </u>                                                                                    8     <u>
</u>x<u> </u>= -<u>50 + 80  </u>                                                               y = <u>24 + 4 √3</u>
           50                                                                                  8  
x = <u>-50 + 80</u><u> </u>                         <u />                                       y = <u>24 + 4 √3 </u>
           50                                                                                   8
x =<u> -50 + 80</u>   x = <u>-50 - 80</u>                                            y = <u>24 + 4 √3</u>     y = <u>24 - 4 √3</u>
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x = <u>30</u>            x = -<u>130</u>                                                  y = <u>28 √3</u>            y = <u>20 √3</u>
      50                    50                                                              8                         8
x = <u>3</u>              x = <u>-13</u>                                                  y = <u>28 √3</u>               y = <u>20 √3</u>
      5                      5                                                             8                            8
 (x, y) = (<u>3</u>, <u>26 √3</u>)                                                        (x, y) = (<u>-13</u>, <u>20 √3 </u>)
              5     8                                                                            5      8
8 0
4 years ago
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