I need help plz will give brainliest!!!

Mathematics

1 answer:

Leokris [45]3 years ago

7 0

Answer:

18 red marbles

Step-by-step explanation:

Because the ratio of yellow marbles to red marbles is 1:6 in the population, the expected number of red marbles is 6 times the number of yellow marbles in the representative sample. there should be 18 red marbles.

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a motorboat travels 305km in 5 hours going upstream and 651km in 7 hours going downstream. What is the rate of the boat in still

Ghella [55]

Recall your d = rt, distance = rate * time.

b = speed rate of the boat.

c = speed rate of the current.

keeping in mind that, as the boat goes Upstream, against the current, it's speed is not "b", but is really " b - c ", because the current is subtracting speed from it.

likewise, when the boat is going Downstream, because is going with the current, is really going faster at " b + c ".

$\bf \begin{array}{lccclll}
&\stackrel{km}{distance}&\stackrel{kmh}{rate}&\stackrel{hours}{time}\\
&------&------&------\\
Upstream&305&b-c&5\\
Downstream&651&b+c&7
\end{array}
\\\\\\
\begin{cases}
305=(b-c)(5)\implies 61=b-c\implies 61+c=\boxed{b}\\
651=(b+c)(7)\implies 93=b+c\\
----------------------\\
93=\boxed{61+c}+c
\end{cases}
\\\\\\
93=61+2c\implies 32=2c\implies \cfrac{32}{2}=c\implies 16=c$

what is the speed of the boat? well, 61 + c = b.

6 0

4 years ago

10.

True [87]

Answer:

Good question. That's a hard one but I think it's C. {(-4,-6), (-3,-2), (1,-2), (1,0)}

Step-by-step explanation:

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3 years ago

A science class conducts an experiment using a falling object. The class determines that a quadratic regression equation y = –15

ser-zykov [4K]

Answer:

67.4 + 1.5 = 68.9

Step-by-step explanation:

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3 years ago

A bag contains two red marbles, three blue marbles and four green marbles what is the sample space

Yuki888 [10]

Answer:

Given in a bag contains five green marbles, three blue marbles, two red marbles and two yellow marbles

(a)The four colour out comes not equally because the number of four colours balls are different.

(b) Total ball =5+3+2+1=11

Then probability (green) =

Then probability (blue) =

Then probability (red) =

Then probability (yellow) =

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3 years ago

Solve with steps please.<br> Urgenttt

aleksklad [387]

The answer is -48.
You have to plug in -6 where x is.

4 0

3 years ago