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3 years ago

Two cars leave the same driveway traveling opposite directions. If one car travels 40

Mathematics

1 answer:

GuDViN [60]3 years ago

6 0

Answer:

1.06 hours

Step-by-step explanation:

D=rate*time

r=40,45

d=90

t=idk

40t+45t=90

85T=90

-now divide both sides by 85

85T/85=T

90/85=1.06

SO t=1.06 HOURS

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2(a + 3) = −4 i need help i don't understand

kkurt [141]

Answer: a = -5

Step-by-step explanation:

2(a+3)=-4

Distribute

2a+6=-4

subtract the six with the four and you get -10

-6-4=-10

now divide 2a with -10

you get a= -5

you can plug the answer in

3 0

3 years ago

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Exercise 2.4.2: Proving statements about rational numbers with direct proofs. About Prove each of the following statements using

IgorLugansk [536]

Answer:

See Explanation

Step-by-step explanation:

(a) Proof: Product of two rational numbers

Using direct proofs.

Let the two rational numbers be A and B.

Such that:

$A = \frac{1}{2}$

$B = \frac{2}{3}$

The product:

$A * B = \frac{1}{2} * \frac{2}{3}$

$A * B = \frac{1}{1} * \frac{1}{3}$

$A * B = 1 * \frac{1}{3}$

$A * B = \frac{1}{3}$

Proved, because 1/3 is rational

(b) Proof: Quotient of a rational number and a non-zero rational number

Using direct proofs.

Let the two rational numbers be A and B.

Such that:

$A = \frac{1}{2}$

$B = \frac{2}{3}$

The quotient:

$A / B = \frac{1}{2} / \frac{2}{3}$

Express as product

$A / B = \frac{1}{2} / \frac{3}{2}$

$A / B = \frac{1*3}{2*2}$

$A / B = \frac{3}{4}$

Proved, because 3/4 is rational

(c) x + y is rational (missing from the question)

Using direct proofs.

Let x and y be

Such that:

$x = \frac{1}{2}$

$y = \frac{2}{3}$

The sum:

$x + y = \frac{1}{2} + \frac{2}{3}$

Take LCM

$x + y = \frac{3+4}{6}$

$x + y = \frac{7}{6}$

Proved, because 7/6 is rational

<em>The above proof works for all values of A, B, x and y; as long as they are rational values</em>

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3 years ago

Anyone have an aswer to this?

KIM [24]

X/1 would equal -2- square root of 11 and x2 would equal -2 plus square root of 11

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2 years ago

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What percent of 25 is 30

Thepotemich [5.8K]

0.833333333% is the answer

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2 years ago

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notka56 [123]

The answer would be c

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2 years ago