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3 years ago

HELP ASAP ILL GIVE 18 POINTS

Mathematics

2 answers:

Kitty [74]3 years ago

5 0

Answer:

729

Step-by-step explanation:

san4es73 [151]3 years ago

3 0

The awnser is 729 Bc 81 times 9 equals 729

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Find the gradient of the line segment between the points (0,3) and (1,8).

maks197457 [2]

Answer:

0.54

Step-by-step explanation:

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3 years ago

a theater can seat 391 people .the number of rows is 6 less than the number of seats in each row.how many rows of seats are ther

Tema [17]

X(x-6) = 391
x2-6x-391 =0(x-23)(x+17)=0

since the number of seats should be positive,

x = 23

The number of rows is 23 - 6 = 17

( To check our work )

391 / 17 = 23

So, there are 17 rows of seats.

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3 years ago

Find the missing side of each triangle. Round answers to nearest tenth. Please show your work

kherson [118]

Answer:

the value of x is 14.56

Step-by-step explanation:

by using Pythagorean theorem

x²=13.6²+5.2²

x²=212

x=14.56

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3 years ago

Can someone help me on this question

kirza4 [7]

CAB is the right answer.

3 0

3 years ago

Solve cosθ-cos2θ+cos3θ-cos4θ=0

Alik [6]

Answer:

θ = (2/5)πk or π(k +1/2) . . . . . for any integer k

Step-by-step explanation:

We can make use of the identities ...

$\cos{\alpha}-\cos{\beta}=-2\sin{\dfrac{\alpha+\beta}{2}}\sin{\dfrac{\alpha-\beta}{2}}\\\\\sin{\alpha}+\sin{\beta}=2\sin{\dfrac{\alpha+\beta}{2}}\cos{\dfrac{\alpha-\beta}{2}}$

These let us rewrite the equation as ...

$0=\cos{\theta}-\cos{2\theta}+\cos{3\theta}-\cos{4\theta}\\\\0=-2\sin{\dfrac{\theta+2\theta}{2}}\sin{\dfrac{\theta-2\theta}{2}}-2\sin{\dfrac{3\theta+4\theta}{2}}\sin{\dfrac{3\theta-4\theta}{2}}\\\\0=2\sin{\dfrac{\theta}{2}}\left(\sin{\dfrac{3\theta}{2}}+\sin{\dfrac{7\theta}{2}}\right)\\\\0=4\sin{\dfrac{\theta}{2}}\sin{\dfrac{3\theta+7\theta}{4}}\cos{\dfrac{3\theta-7\theta}{4}}\\\\0=4\sin{\dfrac{\theta}{2}}\sin{\dfrac{5\theta}{2}}\cos{\theta}$

The solutions are the values of θ that make the factors zero. That is, ...

θ = 2πk . . . . for any integer k

θ = (2/5)πk . . . . for any integer k (includes the above cases)

θ = π(k +1/2) . . . . for any integer k

6 0

4 years ago