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2 years ago

Help me please on the wrong answers (C means correct)

Mathematics

2 answers:

yan [13]2 years ago

7 0

The answer for 3 is 5 7/8

Ulleksa [173]2 years ago

3 0

For number 6 it is d

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2 years ago

Determine the domain of the function. f(x)=4/x^2

harkovskaia [24]

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David bought three candy bars for $2.45. Assuming that each candy bar is the same price, what is the unit rate for the cost of t

xxMikexx [17]

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1 year ago

STAAR Review= the ratio of number of boy to girls is 5 to 4 . there are 60 girls how many boys is in the choir

3241004551 [841]

Answer:

75 boys

Step-by-step explanation:

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4 0

2 years ago

Read 2 more answers

dos aviones parten de una ciudad con direcciones S32°E y E57°N¿ cuál es el angulo que forma sus direcciones?

Elan Coil [88]

Answer:

El ángulo formado entre las dos direcciones es aproximadamente 115º.

Step-by-step explanation:

Las direcciones dadas en el enunciado significan lo siguiente:

S32ºE - 32º al este del sur.

E57ºN - 57º al norte del este.

Vectorialmente hablando, cada dirección es la siguiente:

S32ºE

$A(x,y) = (\sin 32^{\circ}, -\cos 32^{\circ})$

$A(x,y) = (0.530, -0.848)$

E57ºN

$B(x,y) = (\cos 57^{\circ},\sin 57^{\circ})$

$B(x,y) = (0.545, 0.839)$

El ángulo formado entre los dos vectores unitarios ( $\theta$ ), medido en grado sexagesimales, puede determinarse mediante la siguiente ecuación vectorial:

$\theta = \cos^{-1} \frac{A\,\bullet \,B}{\|A\|\cdot \|B\|}$

Donde:

$\|A\|$ - Norma de $A(x,y)$ .

$\|B\|$ - Norma de $B(x,y)$ .

Si sabemos que $A(x,y) = (0.530, -0.848)$ , $B(x,y) = (0.545, 0.839)$ , $\|A\| = 1$ y $\|B\| = 1$ , entonces el ángulo formado entre los dos vectores es:

$\theta = \cos^{-1} \frac{(0.530)\cdot (0.545)+(-0.848)\cdot (0.839)}{(1)\cdot (1)}$

$\theta \approx 115^{\circ}$

El ángulo formado entre las dos direcciones es aproximadamente 115º.

4 0

2 years ago