To simplify, you must distribute the 2 into the 5x and -4 by multiplying 2 with 5x and 2 with -4.

2(5x – 4) + 3x

2 x 5x = 10x

2 x -4 = -8

You will get 10x - 8 + 3x

Now you must combine like terms or add like terms. In this case we must add 10x and 3x

10x + 3x = 13x

Finally the answer would be 13x - 8

6 0

3 years ago

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Consider the triangle. 45° 80° Find the measure of the unknown third angle.

Elina [12.6K]

Answer:

$55 \degree$

Step-by-step explanation:

Let the unknown angle be x

As the interior angles in a triangle are added up to 180°

$x + 45 + 80 = 180 \\ x + 125 = 180 \\ x = 180 - 125 \\ x = 55 \degree$

Hope this helps you.

Let me know if you have any other questions:-)

6 0

3 years ago

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The ratio of girls to boys in Mr. Smith's homeroom is 3:4. The ratio in Mr. Smith's homeroom to students in the whole 7th grade

Leno4ka [110]

3:4 = G:B

1:5 = Mr. Smith's class: 7th Grade

2:7= 7th: Middle school

12 girls = 3 units

1 unit = 12/3= 4

Boys = 4x4= 16

Whole class = 28 students

Class : Grade = 1:5 7 = number of units in Mr. Smith's class

28 = 1 unit

5 units= 28x5= 140 There are 140 kids in the grade

140 = 2 units

1 unit = 140/2= 70

70x7=490

There are 490 students in the whole grade

6 0

3 years ago

Find the coordinates of E' after a dilation with a scale factor of 2.

V125BC [204]

Answer:

(more information is needed, the origin of the dilation and the coordinates for E)

4 0

3 years ago