Ask question

Ask question

All categories

4 years ago

11

Given right triangle ABC with altitude BD drawn to hypotenuse AC. If AC = 20 and DC = 5, what is the length of BC? (Note: the fi

gure is not drawn to scale.)

1 answer:

11111nata11111 [884]4 years ago

4 0

Answer:

21.2 or 15 sqrt of 2 (PETHAGOREOM theorem)

Step-by-step explanation:

a^2+b^2=c^2

20^2+5^2=C^2

400+25=C^2

450=C^2

sqrt 450=

15 sqrt of 2 or 21.2

You might be interested in

What is a ratio of 2 measures that have different units

hjlf

The answer to your question is RATE. It is a unique ratio wherein it uses 2 different units of measurement to be compared. It is written mostly in the word "per" like words per hour or the symbol "/" like meters/hour.

4 0

4 years ago

Plz answer below 38 pts and will mkae u brainliest.

mestny [16]

Answer:

Question 1: She needs 12 blue beads and 48 black beads.

Question 2: She needs 10 blue beads and 25 black beads.

Step-by-step explanation:

I used ratios

question one's ratio is 3:12 and the second one's ratio is 4:10. If you keep that ratio consistent than those are the numbers you get based on the number of beads long she wants her necklace.

that's my best guess

7 0

3 years ago

una fabrica de coches realiza modelos de tres motorisaiones. (1600,1800,2000 cc.) en cinco colores cada uno (blanco,negro,azul,m

Aloiza [94]

Answer:

a car factory makes models of three engines. (1600,1800,2000 cc.) In five colors each (white, black, blue, yellow and red) and with three, four or five doors each type. You would be able to indicate the number of different car models that this factory makes?

7 0

3 years ago

Solve with cramer's rule x+2y+3z=11, 2x+y+2z=10, 3x+2y+z=9

nalin [4]

Answer:

x = 2 , y = 0 , z = 3

Step-by-step explanation:

Cramer's rule is a rule through which we can find the solution of linear equation.

we have the three linear equations as

x+2y+3z=11

2x+y+2z=10

3x+2y+z=9

AX=B

A: coefficient matrix

X= unknown vectors(x,y,z)

D = values of the linear equation (11 , 10 , 9)

now we find the determinant of the given linear equation

determinant of the matrix will be

A = $\left[\begin{array}{ccc}1&2&3\\2&1&2\\3&2&1\end{array}\right]$ = 1(1-4) - 2(2-6) + 3(4 - 3)

= 1(-3) - 2(-4) + 3(1)

= -3+8+3 = 8

also D $\neq 0$

so the determinant is Non zero we can apply Cramer's rule

we will be replacing the first column of the coefficient matrix A with the values of D

by replacing the first column we will get the value of the variable 'x'

Dx = $\left[\begin{array}{ccc}11&2&3\\10&1&2\\9&2&1\end{array}\right]$ = 11(1-4) -2(10-18) + 3(20-9) = -33+16+33 = 16

x = $\frac{Dx}{D}$ = $\frac{16}{8}$ = 2

similarly

Dy = $\left[\begin{array}{ccc}1&11&3\\2&10&2\\3&9&1\end{array}\right]$ = 1(10-18) -11(2-6) + 3(18 -30) = -8 +44 -36 = 0

y = $\frac{Dy}{D}$ = 0

Dz= $\left[\begin{array}{ccc}1&2&11\\2&1&10\\3&2&9\end{array}\right]$ = 1(9 - 20) -2(18 - 30) + 11(4 -3) = -11 +24 +11 = 24

z = $\frac{Dz}{D}$ = $\frac{24}{8} = 3$

so we have the solution as

x = 2 , y = 0 , z = 3

Therefore the solution for the given linear equations is (2,0,3).

3 0

3 years ago

If it takes 100,000 years for a plate to move two kilometers, how long will it take Los Angeles, on the edge of the Pacific Plat

Elis [28]

Answer: 27.9 million years.

Step-by-step explanation:

If it takes a plate 100,000 years to move 2 kilometers, and you are calculating how long it will take to move 558 kilometers, you can divide 588 by 2 to get 279, then multiply 279 by 100,000 to determine how many years it will take. In this case, it will take the Pacific plate 27,900,000 years to slide alongside San Francisco.

7 0

3 years ago