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Inessa [10]
3 years ago
5

2a +5 - 3a -12 please

Mathematics
2 answers:
chubhunter [2.5K]3 years ago
7 0

Answer:

-7-a

Step-by-step explanation:

2a-3a +5-12

-a - 7

or -7-a

Nastasia [14]3 years ago
3 0

Answer:

-a - 7

Step-by-step explanation:

Add like terms to simplify the expression:

2a + 5 - 3a - 12

Add together 2a and -3a:

2a - 3a = -a

Add together 5 and -12:

5 - 12 = -7

Add these together:

-a - 7

So, the simplified expression is -a - 7

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Subtract fractions with different denominators
Tems11 [23]

Answer:

\frac{10}{15}-\frac{2}{5}=\frac{4}{15}

Step-by-step explanation:

We know that

  • A fraction consists of two integers—one on the top, and one on the bottom.
  • The top one is numerator, the bottom one is denominator, and
  • These two numbers are separated by a line.

Let us consider two different fractions with different denominators

  • \frac{10}{15}
  • \frac{2}{5}

Lets subtract the two fractions

\frac{10}{15}-\frac{2}{5}\:\:\:\:

\mathrm{Cancel\:}\frac{10}{15}:\quad \frac{2}{3}

=\frac{2}{3}-\frac{2}{5}

\mathrm{Least\:Common\:Multiplier\:of\:}3,\:5:\quad 15

\mathrm{Adjust\:Fractions\:based\:on\:the\:LCM}

\mathrm{For}\:\frac{2}{3}:\:\mathrm{multiply\:the\:denominator\:and\:numerator\:by\:}\:5

\frac{2}{3}=\frac{2\cdot \:5}{3\cdot \:5}=\frac{10}{15}

\mathrm{For}\:\frac{2}{5}:\:\mathrm{multiply\:the\:denominator\:and\:numerator\:by\:}\:3

\frac{2}{5}=\frac{2\cdot \:3}{5\cdot \:3}=\frac{6}{15}

so

=\frac{10}{15}-\frac{6}{15}

\mathrm{Since\:the\:denominators\:are\:equal,\:combine\:the\:fractions}:\quad \frac{a}{c}\pm \frac{b}{c}=\frac{a\pm \:b}{c}

=\frac{10-6}{15}

\mathrm{Subtract\:the\:numbers:}\:10-6=4

=\frac{4}{15}

Therefore,

\frac{10}{15}-\frac{2}{5}=\frac{4}{15}

5 0
3 years ago
Help me please that's problem number3 .help me
Firlakuza [10]

A) Both walked 3.5 hours.

B) Hannah walked 3.5 x 3 = 10.5 miles.

For Hannah you multiplied her rate by the time to get total distance.

Penelope walked 7 miles, the black dot on the graph is at the 7 miles on the distance.

C) Hannah walked a faster rate, because she walked further in the same amount of time.

5 0
3 years ago
2. The center of a circle is at (4,-5). The radius of the circle is 10 units. Write the equation of the
abruzzese [7]

Answer:

Step-by-step explanation:

8 0
2 years ago
Whats the answer of this problem <br> 8-1*0+2/2=??
Reptile [31]
If I'm doing this right, I'm pretty sure the answer would be 7, since 0 + 1 = 1, 8 - 1 = 7, and 7 x 1 = 7.

I hope this answer helped you! If you have any further questions or concerns, feel free to ask! :)
3 0
3 years ago
You can drive your car for 4.5 hours at the average speed of 70 miles per hour. how far did you go?
Zigmanuir [339]

Answer:


Step-by-step explanation:

28.5


3 0
3 years ago
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