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Anvisha [2.4K]
1 year ago
15

- 16m’n-(-25m’n)+(-7m’n)Which of the following is equivalent to the expression above?

Mathematics
1 answer:
Westkost [7]1 year ago
5 0

As a rule , - times - = + and - times + = -

\begin{gathered} -16m^2n-(-25m^2n)+(-7m^2n\text{ ) } \\ =-16m^2n+25m^2n-7m^2n\text{  ( based on the rule above )} \\ =+9m^2n-7m^2n\text{    ( -16 + 25 = + 9 )} \\ =+2m^2n \end{gathered}

Therefore the correct answer to the question is 2m squared n

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Question 5
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Answer:

The missing value is 2

Step-by-step explanation:

A direct variation satisfies the equation y=kx.

Since the point (-18, 12) lies on this line, it must satisfy this equation.

\implies 12=-18k

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How old is molly if she was 52 years old when she was fourteen years ago?
meriva
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8 0
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Solve the equations below:
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<h2><em><u>Answ</u></em><em><u>er</u></em><em><u>:</u></em><em><u>-</u></em></h2>

<h3>1.) 3x + 2 = 15</h3>

➪ 3x = 15 - 2

➪ 3x = 13

★ \large\pink{x = \sf{\dfrac{13}{3}}}

⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀

<h3>2.) 5x - 8 = 52</h3>

➪ 5x = 52 + 8

➪ 5x = 60

➪ x = \sf\dfrac{60}{5}

★ \large\pink{x = 12}

⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀

<h3>3.) 2(x+1) = 14</h3>

➪ 2x + 2 = 14

➪ 2x = 14 - 2

➪ 2x = 12

➪ x = \sf\dfrac{12}{2}

★ \large\pink{x = 6}

⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀

<h3>4.) 1/4 x + 6 = 12</h3>

➪ \sf\dfrac{1}{4} \times x = 12 - 6

➪ \sf\dfrac{1}{4} \times x = 6

➪ \sf 1 \times x = 6 \times 4

★ \large\pink{x = 24}

⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀

<h3>5.) 1/5 + 2y = 2/5</h3>

➪ \sf 2y = \dfrac{2}{5} - \dfrac{1}{5}

➪ \sf 2y = \dfrac{2-1}{5}

➪ \sf 2y = \dfrac{1}{5}

➪ \sf y = \dfrac{1}{5 \times 2}

★ \large\pink{y = \dfrac{1}{10}}

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