3 years ago

I need help with this question

Mathematics

1 answer:

kap26 [50]3 years ago

5 0

Answer:

the answer is attached to the picture

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Determine the value of a so that A = 2i+aj+k and B = 4i-2j-2k are perpendicular

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In order to make them perpendicular, their dot product must result in zero. so:

$4 \times 2 - 2a - 2 \times 1 = 0$

$2a = 8 - 2 = 6$

$a = 3$

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A triangle has angle measures of 44°,(3x+8), and (4c-12)°. Classify the triangle by its angles

mars1129 [50]

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Draw and label a tape diagram to represent the following (choose two to do):

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2 years ago

Write an equation for an ellipse centered at the origin, which has foci at (0,\pm\sqrt{63})(0,± 63 )left parenthesis, 0, comma

steposvetlana [31]

Answer:

$\frac{x^{2} }{4312 } + \frac{y^{2} }{8281 }$

Step-by-step explanation:

Since the foci are at(0,±c) = (0,±63) and vertices (0,±a) = (0,±91), the major axis is the y- axis. So, we have the equation in the form (with center at the origin) $\frac{x^{2} }{b^{2} } + \frac{y^{2} }{a^{2} }$ .

We find the co-vertices b from b = ±√(a² - c²) where a = 91 and c = 63

b = ±√(a² - c²)

= ±√(91² - 63²)

= ±√(8281 - 3969)

= ±√4312

= ±14√22

So the equation is

$\frac{x^{2} }{(14\sqrt{22}) ^{2} } + \frac{y^{2} }{91^{2} } = \frac{x^{2} }{4312 } + \frac{y^{2} }{8281 }$

8 0

3 years ago

Help me with this question thingy plas

pochemuha

ANSWER:

x = -3

Step-by-step explanation:

55+54+x+74=180

109+x+74=180

183 + x = 180

x = -3

8 0

2 years ago

Read 2 more answers