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dybincka [34]
3 years ago
7

Please answer this question quickly!

Mathematics
1 answer:
mixer [17]3 years ago
6 0

40 \times 15 = 600 \div 3 = 200m \: and \: the \: formula \: is \: to \: divide \: and \: multipliction
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Given right triangle ABC with altitude BD drawn to hypotenuse AC. If AD = 4
Vinil7 [7]

Answer:

BD = 6

Step-by-step explanation:

Theorem:  The altitude to the hypotenuse of a right triangle is the mean proportional between the segments of the hypotenuse.

So, \frac{4}{BD} = \frac{BD}{9}

BD^{2}  = 36

BD = 6

See how easy that is IF you know the theorem.

4 0
3 years ago
I'm begging someone please help pleasedeeeeeeeeeeeeee PLEASEEWW SOMEONE I REALLY NEED HELPPP PLEASEEEEEEE​
artcher [175]

Answer:

2 oldies and 6 new releases

Step-by-step explanation:

let x equal number of oldies

let y equal number of new releases

2x + 4y = 28

x + y = 8

x = 8 - y

2(8 - y) + 4y = 28

16 - 2y + 4y = 28

2y = 28 - 16

2y = 12

y = 12/2

y = 6

x = 8 - y

x = 8 - 6

x = 2

8 0
2 years ago
Dado dos ángulos complementarios, uno mide (2x + 10) y el otro (x + 20),
rusak2 [61]

Answer:

El valor de <em>x</em> es igual a 20 o <em>x</em> = 20.

Step-by-step explanation:

Lo primero que se debe saber es que <em>dos ángulos complementarios suman un ángulo recto o 90º</em>.

Supongamos que el valor de un ángulo \\ \alpha y un ángulo \\ \beta valen:

\\ \alpha = 2x + 10 [1]

\\ \beta = x + 20 [2]

Como la suma de  \\ \alpha + \beta = 90 [3]

Entonces

\\ \alpha + \beta = (2x + 10) + (x + 20) = 90

Sumamos los factores comunes entre si:

\\ (2x + x) + (10 + 20) = 90

Para la primera expresión debemos recordar que se suman sólo los coeficientes. Así:

\\ (2 + 1)x + (10 + 20) = 90

\\ 3x + 30 = 90

Para despejar la incógnita <em>x</em>, debemos tener en cuenta que <em>una igualdad no se altera si se suma, se resta, se multiplica o divide un mismo valor a cada lado de ella</em>. Por esta razón, para despejar 3x, lo primero que podemos hacer es sumar -30 a cada lado de la expresión (lo que es igual a restar 30 a cada lado de la misma). Así tenemos:

\\ 3x + 30 - 30 = 90 - 30

\\ 3x + 0 = 90 - 30

\\ 3x = 60

Ahora dividimos cada miembro de la igualdad entre 3 (o multiplicamos cada lado de la igualdad por \\ \frac{1}{3} ):

\\ \frac{3}{3}x = \frac{60}{3}

Como sabemos que:

\\ \frac{3}{3} = 1

Entonces:

\\ 1*x = \frac{60}{3}

\\ x = \frac{60}{3}

\\ x = 20

De esta manera, el valor de <em>x</em> es igual a 20 o x = 20.

Lo anterior lo podemos comprobar considerando las ecuaciones [1], [2] y [3]. Así tenemos que:

\\ \alpha = 2x + 10 [1]

Sustituimos x por el valor de 20:

\\ \alpha = 2*20 + 10 = 40 + 10 = 50

\\ \beta = x + 20 [2]

Hacemos lo mismo para [2]:

\\ \beta = 20 + 20

\\ \beta = 40

De esta manera:

\\ \alpha + \beta = 90 [3]

\\ 50 + 40 = 90

4 0
3 years ago
Solve for d.<br> d + 67 = 87<br> р<br> Submit
Vsevolod [243]

Answer:

d=20

Step-by-step explanation:

d+67=87

Subtract 67 from both sides

d=20

Hope this is helpful

7 0
3 years ago
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Name a rational number between the two given numbers? 7/11ths and 4/7ths explain how you know​
Alex_Xolod [135]

Answer:

basically u have to beble gep

Step-by-step explanation:

art

4 0
3 years ago
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