<img src="https://tex.z-dn.net/?f=9x%5E%7B2%7D" id="TexFormula1" title="9x^{2}" alt="9x^{2}" align="absmiddle" class="latex-form

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chubhunter [2.5K]

3 years ago

ula"> + $3x^{2}$

Mathematics

2 answers:

Marina86 [1]3 years ago

7 0

9x²＋3x²
＝(9＋3)x²
＝12x²

Hope my answer helped u :)

sweet-ann [11.9K]3 years ago

3 0

Answer:

12x^2

Step-by-step explanation:

All you need to do is combine like terms

since 9x^2 and 3x^2 are like terms with the same variable and same degree, they can be combined to get 12x^2

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3 years ago

The scores on a test for a sample of 42 statistics students are summarized in the following table. 9, 90, 18, 80, 15, 70. Find t

igomit [66]

<h3>Answer: 78.6</h3>

Work Shown:

$\begin{array}{|c|c|} \cline{1-2}\text{Number of People} & \text{Score}\\\cline{1-2}9 & 90\\\cline{1-2}18 & 80\\\cline{1-2}15 & 70\\\cline{1-2}\end{array}$

Multiply across the rows to form a third column. Example: 9*90 = 810 in the first row.

$\begin{array}{|c|c|c|} \cline{1-3}\text{Number of People} & \text{Score} & \text{Number*Score}\\\cline{1-3}9 & 90 & 810\\\cline{1-3}18 & 80 & 1440\\\cline{1-3}15 & 70 & 1050\\\cline{1-3}\end{array}$

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2 years ago