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Vlad [161]
3 years ago
13

Which expression has a value of 18?

Mathematics
1 answer:
Anarel [89]3 years ago
5 0
I can't see the expressions
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Triangle DEF has vertices D(0,0), E(7,0), and F(3,7).
Leni [432]

Answer:

(3, 1.7)

Step-by-step explanation:

The point at which the vertices of a triangle meet is known as the orthocenter of the triangle. The orthocenter passes through the vertex of the triangle and is perpendicular to the opposite sides.

Two lines are perpendicular if the product of their slopes is -1.

The slope of the line joining D(0,0), F(3,7) is:

m_1=\frac{7-0}{3-0}=\frac{7}{3}

The slope of the line perpendicular to the line joining D and F is -3/7. The orthocenter is perpendicular to the line joining D and F and passes through vertex E(7, 0). The equation is hence:

y-y_1=m(x-x_1)\\\\y-0=-\frac{3}{7} (x-7)\\\\y=-\frac{3}{7}x+3 \ .\ .\ .\ (1)

The slope of the line joining E(7,0), and F(3,7). is:

m_1=\frac{7-0}{3-7}=-\frac{7}{4}

The slope of the line perpendicular to the line joining E and F is 4/7. The orthocenter is perpendicular to the line joining E and F and passes through vertex D(0, 0). The equation is hence:

y-y_1=m(x-x_1)\\\\y-0=\frac{4}{7} (x-0)\\\\y=\frac{4}{7} x\ .\ .\ .\ (2)

The point of intersection of equation 1 and equation 2 is the orthocenter. Solving equation 1 and 2 simultaneously gives:

x = 3, y = 1.7

4 0
3 years ago
A regular octagon rotates 360° about its center. How many times does the image of the octagon coincide with the preimage during
True [87]
Hello there!

The correct answer is D. 8.

Hope This Helps You!
Good Luck :)
4 0
3 years ago
John and Alan have a collection of x baseball cards. John has x/4 cards. What fraction of the cards does Alan have?
yulyashka [42]
X-x/4
4x-x/4
3x/4
alan has 3x/4 cards.   
5 0
4 years ago
Which features describe the graph? Select all that apply
victus00 [196]

Answer:

- Decreasing  

Step-by-step explanation:

im not sure of the last two but the others are for sure a no

8 0
3 years ago
You earn 216 out of a possible 250 point on a report. How much percent is that?
elena-s [515]

Answer:

Letter Grade: B Percentage: 80-89

Step-by-step explanation:

You got 216/250, so divide 216/250 and you get 0.864. This means 216 is 86.4 percent of 250 :)

3 0
3 years ago
Read 2 more answers
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