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3 years ago

9x-6a=-7,find x when a =-7

Mathematics

1 answer:

Stella [2.4K]3 years ago

6 0

Answer:

Step-by-step explanation:

Plug in -7 for the variable a.

9x - 6(-7) = -7

Follow PEMDAS. Note the equal sign, what you do to one side, you do to the other. Isolate the variable, x.

Multiply -6 with -7

9x - 6(-7) = -7

9x + 42 = -7

Isolate the variable x. Subtract 42 from both sides

9x + 42 (-42) = -7 (-42)

9x = -49

Divide 9 from both sides

(9x)/9 = (-49)/9

x = (-49)/9

x = ~5.44 (rounded)

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3 years ago

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Nina [5.8K]

Answer:

40287600 = B. 4 x $10^{7}$

Step-by-step explanation:

<u>We first have to do the multiplication of the numbers given:</u>

19 * 2,120,400

=> 40287600

<u>Now we have to figure out how many digits are after the number 4:</u>

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Meaning that we need an exponent of 7 for it to be in scientific notation, giving us with the answer B. 4 x $10^{7}$

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3 years ago