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jekas [21]
3 years ago
7

Answer with explanation please!

Mathematics
1 answer:
VLD [36.1K]3 years ago
3 0

Answer:

E

Step-by-step explanation:

The external angle of a triangle is equal to the sum of the 2 opposite interior angles.

8x + 15 is an external angle of the triangle, thus

8x + 15 = 3x + 20 + 4x + 5, that is

8x + 15 = 7x + 25 ( subtract 7x from both sides )

x + 15 = 25 ( subtract 15 from both sides )

x = 10

Thus none of them on the list → E

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8-2x<4 solve inequality
Andreas93 [3]

Answer:

x > 2

x ∈ ( +2 ; + oo )

Step-by-step explanation:

8 - 2x < 4

8 - 4  < 2x

4 < 2x | : 2

2 < x

x > 2

x ∈ ( +2 ; + oo )

6 0
2 years ago
PLEASE SHOW WORK !!!
Fed [463]
For this, you have to understand the ratios of a 30,60,90 triangle. The ratio(in order) is x, x(sqrt 3), 2x (following the 30,60,90 pattern y'know). Well, we know the length of the hypotenuse, 4.2, so let's use ratios to figure the other sides out. The ratio of AC is x and the ratio of AB is 2x, so 2x/2=x=2.1. One side down. BC has a ratio of x(sqrt 3). We already know x so we can substitute it in. We get 2.1(sqrt 3). To calculate the area, use the formula 1/2(bh). Inputting the values in, we get 1/2(2.1*(2.1(sqrt 3)). This can be calculated to around 3.82. To calculate the perimeter, take the sum of the sides. By adding the sides together, we get about 9.98. Hope you can now understand how to do these kinds of questions.
3 0
2 years ago
What property does this equation show? 25 + (6+5)=(25+6)+5
VLD [36.1K]
Its a distributive propertyyyyyyy.
6 0
3 years ago
Tickets to a show cost $5.50 for adults and $4.25 for students. A family is purchasing 2 adult tickets and 3 student tickets.
Flauer [41]

The first one:

a. $12.00

b. $23.75

c. They would receive $1.25

The second one:

a. $10.00

b. $13.27

c. $3.27

The third one:

I don't know I'm sorry, hope the other ones help though!

8 0
3 years ago
Read 2 more answers
11. A regular polygon has an interior angle sum of 1260°. Solve for n, the number of sides of the polygon.
bagirrra123 [75]

Answer:

Given sum of interior angles = 1260. n = 13.

Step-by-step explanation:

Therefore the number of sides = 13.

8 0
3 years ago
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