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3 years ago

Please can someone help me find X using sin cos and tan

Mathematics

2 answers:

olga_2 [115]3 years ago

3 0

$\sin30^\circ=\dfrac x{25}$

$\implies x=25\sin30^\circ=\dfrac{25}2$

RSB [31]3 years ago

3 0

Answer:

12.5.

Step-by-step explanation:

sin 30 = opposite / hypotenuse:

sin 30 = x / 25

x = 25 sin 30

= 1/2 * 25

= 12.5.

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Jean runs 8 mi and then rides 11 mi on her bicycle on a biathlon. She rides 9 mph faster than she runs. If the total time for he

Ipatiy [6.2K]

Let Jean's speed while running = x mph

Then Jean's speed while riding will be = x+9 mph

Distance covered by running = 8 miles

Distance covered by riding = 11 miles

Total time taken to complete the race = 1.5 hours

As, $time=\frac{distance}{speed}$

So, time for running= $\frac{8}{x}$

And time for riding= $\frac{11}{x+9}$

Equation becomes:

$\frac{8}{x}+\frac{11}{x+9}=1.5$

Now, multiply every term by 2x(x+9) to clear denominators:

$16(x+9)+22x=3x(x+9)$

Simplifying it we get

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Solve the quadratic equation using formula

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putting a=3 , b= -11, c= -144

we get (x - 9)(3x + 16) = 0

where x=9 and x= $\frac{-16}{3}$

Neglect the negative answer as speed cannot be negative, so x = 9 mph

Hence, Jean's running speed is 9 mph and riding speed is x+9 = 9+9 = 18 mph

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3 years ago

What is 2.1 times 3.2 find the missing partial products HELP.

vredina [299]

Given:

The area model for $2.1\times 3.2$ .

To find:

The value of $2.1\times 3.2$ and the missing values in the area model.

Solution:

2.1 can be written as 2 and 0.1 on the left side of the area model.

3.2 can be written as 3 and 0.2 on the top of area model.

Area of the four parts of the area model are:

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$0.1\times 3=0.3$

$0.1\times 0.2=0.02$

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After adding all areas of the area model, we get

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Please can someone help me find X using sin cos and tan​

Please can someone help me find X using sin cos and tan