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3 years ago

Can someone please explain? :(

Mathematics

1 answer:

Travka [436]3 years ago

3 0

Look at the angles inside the triangle.

Two of them are equal !

That tells us that the sides opposite those angles are equal.

So x² + 5 = 248 .

I'll bet you can take it from there and find the value of ' x '. Right ?

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231 km 811 m + 485 km 829 m

Eva8 [605]

231+811+485+829=2356km

6 0

3 years ago

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What is an equation of the line that passes through the point (3, -8) and has a slope -2?

Nataliya [291]

Answer:

y = -2x - 8

Step-by-step explanation:

7 0

2 years ago

Convert x2 + y2 -4x = 0 to polar form.

Bingel [31]

Answer:

$r(r-4\cos \theta)=0$

Step-by-step explanation:

We are given the following equation:

$x^2 + y^2 -4x = 0$

We have to convert it into polar form.

We put

$x = r \cos \theta\\y = r\sin \theta$

Putting values, we get:

$x^2 + y^2 -4x = 0\\(r\cos \theta)^2 + (r\sin \theta)^2 - 4(r\cos \theta) = 0\\r^2(\cos^2 \theta + \sin^2 \theta) - 4r\cos \theta = 0\\r^2 - 4r\cos \theta = 0\\r(r-4\cos \theta)=0$

is the required polar form.

7 0

3 years ago

A fisherman can

viva [34]

Answer:

4 [miles].

Step-by-step explanation:

1) the condition 'the entire trip took 5 hours' can be written as (where t_us - time spent upstream, t_ds - time spent downstream)

$t_{us}+t_{ds}=5;$

2) but the distance [D] upstream is equal the distance downstream, then the condition above can be written:

$\frac{D}{V_{us}} +\frac{D}{V_{ds}} =5; \ (V_{us}-rowing \ upstream,V_{ds}-rowing \ downstream);$

3) finally,

$D=\frac{5V_{us}*V_{ds}}{V_{us}+V_{ds}};$

D=5*4/5=4 [miles].

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1 year ago

Which of the following are solutions to the equation below? Check all that apply. x2 + x - 20 = 0

Mila [183]

Δ = 1 + 4*20 = 81
x' = (-1 + 9)/2 = 4
x'' = (-1 - 9)/2 = -5
4² + 4 - 20 = 0
(-5)² - 5 - 20 = 0
Ok !

7 0

3 years ago

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