3 years ago

Solve the system of equations by multiplying first. Enter the solution as an ordered pair.

Mathematics

2 answers:

saveliy_v [14]3 years ago

8 0

The answer is x=4, y=-2 and the ordered pair would be (4,-2) good luck

soldi70 [24.7K]3 years ago

7 0

Multiply the first equation by -3x for elimination. The answer is (4, -2) x,y

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A flagpole is located at the edge of a sheer y = 70-ft cliff at the bank of a river of width x = 40 ft. See the figure below. An

Gnom [1K]

I would solve this using tangents. Let h be height of flagpole.
Set up 2 right triangles, each with a base of 40.
The larger triangle has height of "h+70"
Smaller triangle has height of 70.

Now write the tangent ratios:
$tan A = \frac{h+70}{40} , tan B = \frac{70}{40}$

Note: A-B = 9
To solve for h we need to use the "Difference Angle" formula for Tangent
$tan (A-B) = \frac{tanA - tanB}{1+tan A tan B}$
Plug in what we know:
$tan(9) = \frac{ \frac{h+70}{40} - \frac{70}{40}}{1+ (\frac{h+70}{40})(\frac{7}{4})}$
$tan (9) = \frac{ \frac{h}{40}}{ \frac{7h +650}{160}} = \frac{4h}{7h+650}$
$h = \frac{650 tan(9)}{4-7 tan(9)}$
$h = 35.6$

7 0

3 years ago

Can someone please answer number 11 from the doc?Thanks:)

Naddik [55]

Hi what is question 11

4 0

3 years ago

The music teacher asked his class to vote for their favorite instrument and created a pie chart to display the results.

nirvana33 [79]

Answer:

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Step-by-step explanation: