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3 years ago

What are the solutions to the equation 9x2 = 49, rounded to the nearest tenth?

Mathematics

2 answers:

Sergio [31]3 years ago

8 0

I would go for A if anything

MariettaO [177]3 years ago

4 0

A.
<span>2.3, –2.3

Working;</span>
$9x^{2} =49$
$x^{2} = \frac{49}{9}$
<span>x=</span> $\sqrt{ \frac{49}{9} }$
x= +-2.3

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A man gets an invoice for $460 with terms 4/10, 1/15, n/30. How much would he pay 6 days after the invoice date?

7nadin3 [17]

Answer:

$441.60

Step-by-step explanation:

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2 years ago

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katen-ka-za [31]

Answer:

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Step-by-step explanation:

To illustrate the angle of elevation and distance, i have drawn it and attached below.

Now, from my diagram;

h = the height of the mound

At his first point of his trip to the foot of the mound, the angle of elevation is 40°, while the horizontal distance to the foot of the mound is "X"

So, by triangle definition,

tan(40°) = h/x

And so;

h = x tan40

h = 0.8391x - - - - (eq 1)

At his second point of the trip to the foot of the mound, Joe is now,

"(x - 450) ft" from the foot of the mound.

Thus, his angle of elevation is 40 + 18 = 58°.

So, by triangle definition,

tan(58°) = h/(x - 450)

h = (x - 450)•(tan(58°))

h = 1.6003(x - 450)

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To get the height(h) of the mound, let's equate (eq1) to (eq2).

0.8391x = 1.6003x - 720.135

1.6003x - 0.8391x = 720.135

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x = 720.135/0.7612

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3 years ago

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Answer:

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3 years ago

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jonny [76]

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3 years ago

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