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elena-14-01-66 [18.8K]
2 years ago
14

Please help on this quiz​

Mathematics
1 answer:
lbvjy [14]2 years ago
7 0
Standard I believe tell me if I’m wrong
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How many possible solutions can a systems of two linear equation in two unknowns have
AfilCa [17]
I believe the correct answer is 1 solution
8 0
3 years ago
A boat takes 4 hours to go 20 miles upstream.It can go 32 miles downstream in same time.Find the rate of the current and the rat
Mandarinka [93]
Recall your d = rt, distance = rate * time.

now, if the boat has a speed of say "b", and the current has a speed of say "c", when the boat is going upstream, is not really going "b" fast, is going " b - c " fast, because the current is eroding speed from it, going upwards.

And when the boat is going downstream, is not going "b" fast either, because the current is now adding to speed to it, so is really going " b + c " fast.

The time it took one way, is the same time it took back, 4 hours each way.

thus

\bf \begin{array}{lccclll}
&\stackrel{miles}{distance}&\stackrel{mph}{rate}&\stackrel{hours}{t}\\
&------&------&------\\
Upstream&20&b-c&4\\
Downstream&32&b+c&4
\end{array}
\\\\\\
\begin{cases}
20=4(b-c)\implies \frac{20}{4}=b-c\implies 5+c=\boxed{b}\\
32=4(b+c)\implies \frac{32}{4}=b+c\implies 8=b+c\\
--------------------\\
8=\left(\boxed{5+c}  \right)+c
\end{cases}
\\\\\\
8=5+2c\implies 3=2c\implies \cfrac{3}{2}=c\implies 1\frac{1}{2}=c

what's the speed of the boat?  well, 5 + c = b.
6 0
3 years ago
HELP ASAP! GIVING BRAINLIEST TO BEST ANSWERS FOR THESE 2 QUESTIONS!
Makovka662 [10]
<h3>Answer:</h3>
  1. Option A
  2. Option D
<h3>Solution:</h3>
  • In order to multiply fractions, we should multiply the numerator of the first fraction times the numerator of the second fraction, like so:
  • 3•5=15
  • Do the same with the denominator:
  • 10•7=70
  • 15/70 is the answer.
  • Same with the other fractions:
  • 7•2=14
  • 10•4=40
  • Hence, 14/40 is the answer.

Hope it helps.

Do comment if you have any query.

3 0
2 years ago
Read 2 more answers
-47+-58 order of operations
kicyunya [14]

Answer: -105

Step-by-step explanation:

:)

7 0
3 years ago
Read 2 more answers
How many solutions does the equation 3x + 6 = −1 − 3 + 4x have
VashaNatasha [74]

Answer:

ONE: x = 10

Step-by-step explanation:

3x + 6 = -1 - 3 + 4x

3x + 6 = -4 + 4x       |subtract 6 from both sides

3x = -10 + 4x      |subtract 4x from both sides

-x = -10      |change the signs

x = 10

6 0
3 years ago
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