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2 years ago

The cost of a train ticket increases by

Mathematics

1 answer:

erastova [34]2 years ago

6 0

It costs $122.4 dollars before the increase.

<h3>How to calculate percentage of a number. Use the percentage formula: P% * X = Y</h3>

Convert the problem to an equation using the percentage formula: P% * X = Y.

P is 17%, X is 7.20, so the equation is 17% * 7.20 = Y.

Convert 10% to a decimal by removing the percent sign and dividing by 100: 10/100 = 0.10.

Therefore, It costs $122.4 dollars before the increase.

Learn more about Finding the Percentage here:

brainly.com/question/24862040

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How many roots does the polynomial function have

satela [25.4K]

The roots of a polynomial are the values that render the polynomial to zero
y=(x+4)(x-2)^2(x+7)
in the 1st parenthesis, x=-4 render the polynomial =0
in the 2nd parenthesis, x=2 render the polynomial =0
in the 3rd parenthesis, x=-7 render the polynomial =0
So there are 3 values as roots of this polynomial (answer C)

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3 years ago

OKAY IM SORRY FOR ALL THESE- BUT I TRULY NEED HELP! THESE ARE CONFUSING! IF YOU KNOW WHAT THE ANSWER IS PLEASE HELP ME OUT!

dexar [7]

Answer:

Step-by-step explanation:

A. Does not have to have symmetry

B. Opposite angles are congruent.

C. Opposite sides are parallel.

D. All sides are NOT congruent.

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3 years ago

The harmonic motion of a particle is given by f(t) = 2 cos(3t) + 3 sin(2t), 0 ≤ t ≤ 8. (a) When is the position function decreas

iren [92.7K]

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$f''(t)=-18\cos3t-12\sin2t$

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$\cos t(3\cos^2t-9\sin^2t+4\sin t)=0$

$\cos t(12\sin^2t-4\sin t-3)=0$

So either

$\cos t=0\implies t=\dfrac{(2n+1)\pi}2$

$12\sin^2t-4\sin t-3=0\implies\sin t=\dfrac{1\pm\sqrt{10}}6\implies t=\sin^{-1}\dfrac{1\pm\sqrt{10}}6+2n\pi$

where $n$ is any integer. We get 8 solutions over the given interval with $n=0,1,2$ from the first set of solutions, $n=0,1$ from the set of solutions where $\sin t=\dfrac{1+\sqrt{10}}6$ , and $n=1$ from the set of solutions where $\sin t=\dfrac{1-\sqrt{10}}6$ . They are approximately