3 years ago

Is the simplified form of 2 13 -2 13 rational? Yes or no

Mathematics

1 answer:

OverLord2011 [107]3 years ago

7 0

Answer:

yes

Step-by-step explanation:

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Which of the following have a common denominator of 18?

vagabundo [1.1K]

A because 2x9 equals 18 and 9x2 equals 18

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3 years ago

Consider the proof. Given: In △ABC, BD ⊥ AC Prove: the formula for the law of cosines, a2 = b2 + c2 – 2bccos(A) Statement Reason

loris [4]

Solution: The missing reason in Step 8 is substitution of $x=c\cos (A)$ .

Explanation:

The given steps are used to prove the formula for law of cosines.

From step 5 it is noticed that our equation is

$a^2=b^2-2bx+c^2$ ..... (1)

From step 7 it is noticed that the value of $x$ is $c\cos (A)$ .

So by substituting $c\cos (A)$ for $x$ in equation (1) we get the equation of step 8, i.e.,

$a^2=b^2-2bc\cos (A)+c^2$

Hence, the missing reason in Step 8 is substitution of $x=c\cos (A)$ .

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3 years ago

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85% of all cars sold in chicago are some color other than black. if three hundred black cars were sold in chicago, how many cars

hram777 [196]

Of 85% of cars sold where not black then 100-85% where black = 15%
let the number of cars sold be y
then 15%*y=300
y= 300 divided by 15%
= (300*100)/15
=2000
therefore 2000 cars were sold

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3 years ago

I don’t understand this helpp

Olenka [21]

Answer:

a. y2×

b.y1×

c.y1×

d.y2×

e.1×

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2 years ago

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Answer:

Step-by-step explanation:

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