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11Alexandr11 [23.1K]
3 years ago
10

McKenna was asked to write the following expression in standard form.

Mathematics
1 answer:
Neko [114]3 years ago
6 0

Answer: -15a - 27

Step-by-step explanation:

McKenna made her first mistake in Step 2. You would need to multiply -5 by 3a and 6, not add it to 3 first.

The correct steps would be:  

3−5(3a+6)

3+(−5)(3a+6) Step 1

3 - 15a - 30 Step 2

-15a - 27 Step 3

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It would be 12 for 6 hours and that last one i don't know sorry
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What is the length of the midsegment of this trapezoid? Enter your answer in the box. units Trapezoid A B C D on the coordinate
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Answer:

  9 units

Step-by-step explanation:

The top base has a length that is the difference between the x-coordinates of points A and B:

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The bottom base has a length that is the difference between the x-coordinates of points C and D:

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3 0
3 years ago
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Mel received notice that his monthly health care rate will increase 20% next year. If Mel currently pays $150 per month for heal
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It will increase by $30

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7 0
3 years ago
I don’t understand the polynomials
Serhud [2]
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constants (like 3, −20, or ½)
variables (like x and y)
exponents (like the 2 in y2), but only 0, 1, 2, 3, ... etc are allowed
that can be combined using addition, subtraction, multiplication and division ...

... except ...

... not division by a variable (so something like 2/x is right out)

So:

A polynomial can have constants, variables and exponents,
but never division by a variable.

Also they can have one or more terms, but not an infinite number of terms.

These are polynomials:

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5
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These are not polynomials

3xy-2 is not, because the exponent is "-2" (exponents can only be 0,1,2,...)
2/(x+2) is not, because dividing by a variable is not allowed
1/x is not either
√x is not, because the exponent is "½" (see fractional exponents)


But these are allowed:

x/2 is allowed, because you can divide by a constant
also 3x/8 for the same reason
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3 years ago
What is 16 over 56 by simplifying fractions
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The answer would be 1 1/7
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