Which is correct gelp

PLEASE HELP ! worth 18 points :)

leonid [27]

Answer:

x = 6.6

Step-by-step explanation:

law of cosines:

x² = b² + c² - 2ac · cosX

x² = 5² + 8² - 2(5 · 8) · cos 55°

x² = 25 + 64 - 80· cos 55°

x² = 25 + 64 - 45.89

x² = 89 - 45.89

x² = 43.11

x = √43.11

x ≈ 6.6

3 0

3 years ago

What is the solution to the system of equations?

sweet [91]

Answer:

The answer is A (-3,4,6).

Step-by-step explanation:

1 Solve for z in -3x-4y+z=-1

z=3x-1+4y

2 Substitute z=3x-1+4y into 2x+y-z=-8

-x-3y+1=-8

3 Substitute z=3x-1+4y into x+8y-z=23

-2x+4y+1=23

4 Solve for x in -x-3y+1=-8

x=-3y+9

5 Substitute x=-3y+9 into z=3x-1+4y

z=-5y+26

6 Substitute x=-3y+9 into -2x+4y+1=23

10y-17=23

7 Solve for y in 10y-17=23

y=4

8 Substitute y=4 into z=-5y+26

z=6

9 Substitute y=4 into x=-3y+9

x=-3

10 Therefore,

x=-3

y=4

z=6

7 0

3 years ago

15.

slamgirl [31]

Answer:

C.

Step-by-step explanation:

❌Option A is incorrect

Rationale: from the graph, 1 hr on the x-axis doesn't correspond to $100 on the y-axis

❌Option B is incorrect

Rationale: from the graph, 2 hrs on the x-axis doesn't correspond to $200 on the y-axis. It can't also be the unit rate because unit rate would be the amount of dollars per 1 hr.

✅Option C is CORRECT

Rationale: from the graph, 8 hrs on the x-axis corresponds to $500 on the y-axis

❌Option D is incorrect

Rationale: from the graph, 4 hr on the x-axis doesn't correspond to $300 on the y-axis

8 0

3 years ago

(05.07) The net of a pyramid is shown below.

mote1985 [20]

Hey. Let me help you on this one.

In order for us to solve this question, we need to break this problem apart. It will make it easier to understand.

In this problem, we see five different figures - four triangles, and one square.

If we want to get the complete net-surface area, we will need to find area of each figure individually, and then, add all values together.

Let's start with a square in the center. Formula for area of a square is $S=a*a$ . In this formula, $S$ stands for total area of a square, and stands for the length of one side.

Let's substitute the values!
$S=4*4$
$S=14$

Area of the square is 14 inches squared. Awesome! Now, let's find the area of all triangles.

We can see that one of the triangles has both measures - base, and the height. We need these two values in order for us to find the measure of the triangles.

Formula for the area of a triangle is $S= \frac{a*b}{2}$ . So, we need to multiply base length by the height length, and divide by two.

$S= \frac{4*8}{2}$
$S= \frac{32}{2}$
$S=16$

Now, we know the area of one triangle. We have three other identical triangles, and in order for us to save time, let's just multiply this number by four.
$16*4=64$

Triangles are 64 inches squared in total.
64 inches squared + 14 inches squared (square area) equals to 78 inches squared.
Answer: $78^{2}$ is the area of the figure

8 0

3 years ago

How do I find the measurements to these angles?

Vera_Pavlovna [14]

Answer:

How do I find the measure of an angle?

Using a Protractor

The best way to measure an angle is to use a protractor. To do this, you'll start by lining up one ray along the 0-degree line on the protractor. Then, line up the vertex with the midpoint of the protractor. Follow the second ray to determine the angle's measurement to the nearest degree.

Step-by-step explanation:

7 0

4 years ago