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3 years ago

5

Which expressions are equivalent? 3x + 5x and 8x 3(x + 4) and 3x + 12 a + b + a and 2a + b 18x + 2y and 15x + 3x + 2x 3a + 4a +

10 and 17a

1 answer:

just olya [345]3 years ago

8 0

Answer: 3x+5x and 8x, 3(x+4) and 3x+12, a+b+a and 2a+b

Step-by-step explanation:

3x+5x is equal to 8x, so they're equivalent

3(x+4) is also equal to 3x+12 when you use the distributive property

a+b+a is also equivalent 2a+b

You might be interested in

Circle the numbers that are evenly divisible by 3

boyakko [2]

Answer:

A Number can by divided by 3 if the sum of its digest can be divided by 3.

27 | 2 + 7 = 9 --> can be divided by 3

45 | 4 + 5 = 9 --> can be divided by 3

60 | 6 + 0 = 6 --> can be divided by 3

75 | 7 + 5 = 12 --> can be divided by 3

8 0

3 years ago

HELP PLEASEEEEEEEEEEEEEEEEEEEEEEEE

Karo-lina-s [1.5K]

<h2>Answer:</h2>

18

Step-by-step explanation:

10$ 180$

10 x 18 = 180

so she work 18 hours.

7 0

3 years ago

– (9 – 5c) + 18 – c = 37 please show your work.

love history [14]

-9 + 5c + 18 - c = 37

4c + 9 = 37
4c = 37 - 9

4c = 28

4c/4 = 28/4

c = 7

hope this helps

4 0

3 years ago

Read 2 more answers

the ratio of apples to oranges on the fruit stand was 31:11 if there were 2,940 apples and oranges altogether, how many apples a

Gala2k [10]

First you add 31 and 11 and you get 42, then you do 2,940 divided by 42 which is 70. Then you multiply 70 by 31, and you get 2, 170,
and there are 2,170 apples which is the answer

4 0

3 years ago

Find the equations of the following lines

White raven [17]

You need these two basic solutions and facts to find the equation of a line:

If you know the gradient $m$ and one point $(x_0,y_0)$ :

$y-y_0=m(x-x_0)$

If you know the gradient two points $(x_1,y_1),\ (x_2,y_2)$ :

$\dfrac{x-x_2}{x_1-x_2}=\dfrac{y-y_2}{y_1-y_2}$

The slope of a line is the coefficient m when you write it in the $y=mx+q$ form
Parallel lines have the same slope
The slopes of perpendicular lines give -1 when multiplied

We can use this list to solve all the exercises:

b)

Use the first equation to get

$y-1=-4(x-2) \iff y=-4x+9$

c)

Use the second equation to get

$\dfrac{x-4}{2-4}=\dfrac{y-2}{-1-2} \iff \dfrac{x-4}{-2}=\dfrac{y-2}{-3}\iff 3(x-4)=2(y-2) \iff 3x-12=2y-4 \iff 2y = 3x-8 \iff y = \frac{3}{2}x-4$

d) same as c)

e) We derive the slope of the line by writing it as

$5y = -x-15 \iff y = -\dfrac{1}{5}x-3$

So, the slope is -1/5. From here, it's the same as b)

f) same as e)

g) Again we find the slope as

$3x+y+2=0\iff y=-3x-2$

so the slope is -3, and a perpendicular line has slope 1/3. From there, it's the same as b).

6 0

4 years ago