3 years ago

What's proportional reasoning and what does it mean for something to be proportional?

1 answer:

6 0

Proportional reasoning is the ability to compare two things using information given, in math, it is most frequently defined as comparing quantities. For something to be proportional, there has to a constant ration of another quantity.

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Given cos = -2/5 a in quadrant III and cos b = 1/4, b in quadrant I find

BigorU [14]

I guess you mean $\cos a=-\dfrac25$ . Since $a$ is in quadrant III, we expect $\sin a$ . Then

$\sin a=-\sqrt{1-\cos^2a}=-\dfrac{\sqrt{21}}5$

Since $b$ is in quadrant I, we expect $\sin b>0$ , so that

$\sin b=\sqrt{1-\cos^2b}=\dfrac{\sqrt{15}}4$

Now,

$\sin(a+b)=\sin a\cos b+\cos a\sin b=-\dfrac{2\sqrt{15}+\sqrt{21}}{20}$

$\cos(a+b)=\cos a\cos b-\sin a\sin b=\dfrac{3\sqrt{35}-2}{20}$

and

$\tan(a+b)=\dfrac{\sin(a+b)}{\cos(a+b)}=-\dfrac{2\sqrt{15}+\sqrt{21}}{3\sqrt{35}-2}$

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3 years ago

HELP DOES ANYONE KNOW HOW TO DO THIS?

natta225 [31]

Answer:

im pretty positive its exponential

Step-by-step explanation:

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3 years ago

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The math club sold roses and tulips this year for Valentine’s day. The number of roses sold was 8 more and 4 times the number of

kobusy [5.1K]

Answer : 76

Step by Step Explanation:

Substitute for "r" and solve for "t":
5(4t+8) + 2t = 414
22t + 40 = 414
22t = 374
t = 17 (# of tulips sold)
---
r = 4*17+8 = 76 (# of roses sold)

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3 years ago

I need help quiz it’s due in 6mins

Cerrena [4.2K]

Answer:

Step-by-step explanation:

66 nickels = 66 x $0.5 = $3.30

$7.80 - $3.30 = $4.50

$4.50 / $0.10 = 45

Brielle has 45 dimes.

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3 years ago

What is 1.04166667 in a fraction?your final answer is: 1.04166667 can be written as the fraction 1 4166667/10000000 ] ]?

dybincka [34]

Yes that answer is correct

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3 years ago