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3 years ago

NOT A QUESTION

Mathematics

2 answers:

Paraphin [41]3 years ago

8 0

Thank you, Mannster03. All of us on Brainly appreciate your help!

myrzilka [38]3 years ago

3 0

thx soo much this is very helpful tome and may otheer students :))))

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A row team paddles 30 miles upstream in 2 hours and 30 miles downstream in 45 minutes. How fast can the row team paddle in still

sp2606 [1]

Answer:

Rate in still water = 27.5 mph

Current's rate = 12.5 mph

Step-by-step explanation:

Let

x mph = row team rate in still water

y mph = current's rate

Upstream:

Distance = 30 miles

Time = 2 hours

Rate = x - y mph

Then

$30=2(x-y)$

Downstream:

Distance = 30 miles

Time = 45 minutes $=\dfrac{3}{4}$ hour

Rate = x + y mph

Then

$30=\dfrac{3}{4}(x+y)$

From the first equation:

$30=2(x-y)\Rightarrow 15=x-y$

From the second equation:

$30=\dfrac{3}{4}(x+y)\Rightarrow 40=x+y$

Add these two equations:

$15+40=x-y+x+y\\ \\2x=55\\ \\x=27.5\ mph$

Subtract these two equations:

$40-15=x+y-(x-y)\\ \\25=x+y-x+y\\ \\2y=25\\ \\y=12.5\ mph$

8 0

4 years ago

1. $1,200,000 is equal to million___dollars. O 0.0012 0 0.12 O 1.2 O 12 O 1200

zhuklara [117]

Answer:

1.2^6

Step-by-step explanation:

cuz count the zeroes, and that is the scientific notation

3 0

4 years ago

Two vectors, X and Y form a right angle. Vector X is 48 inches long and vector Y is 14 inches long. The length of the resultant

krok68 [10]

First Photo - This is the problem drawn into the paper. If you have two vectors and they form a right angle (90°) between them, the Resultant Vector will appear like this, from the right angle.

Obs.:
1 - VR = Resultant Vector;
2 - The angle formed by the VR and the two vectors ISN'T a bisector.

Second Photo - You can move the bottom extremity of the Y vector to the arrow of the X vector and the tips from the Y and VR vectors will meet, forming a Right Triangle, whose the VR is the Hypotenuse (Opposes the right angle / Larger Side).

Now you just put the values in the Pythagorean Theorem:
${a}^{2} = {b}^{2} + {c}^{2}$
Where VR is the "a".

${vr}^{2} = {x}^{2} + {y}^{2} \\ {vr}^{2} = {48}^{2} + {14}^{2} \\ {vr}^{2} = 2304 + 196 \\ {vr}^{2} = 2500 \\ vr = \sqrt{2500} \\ vr = 50 \: inches$

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4 years ago

When you multiply a 4-digit number by a 2-digit number, what is the greatest number of digits the product can have? Explain.

Alisiya [41]

Answer:

Step-by-step explanation:

4 0

3 years ago

Select all the true statements. A. Negative integers are rational numbers B. Mixed numbers are irrational numbers C. Decimal num

nadezda [96]

Answer:

The correct answer is A.; C.; E.

Step-by-step explanation:

A. Negative integers are rational numbers because all integers are rational numbers, i.e. integers are a subset of rational numbers, making the statement correct.

B. Mixed numbers are rational numbers because they can be written in the form of a simple fraction and thus the statement B is wrong.

C. Decimal numbers that terminate, like 0.125, are rational numbers is true as they can be written as a simple fraction making the statement true.

D. Decimal numbers that go on forever with repeating patterns, like 4.272727..... are irrational numbers is false as they can also be represented by a simple function making them rationals.

E. Decimal numbers that go on forever with no repeating patterns are irrational numbers as they can never be written as a simple fraction making the statement E true.

6 0

3 years ago