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Romashka-Z-Leto [24]
3 years ago
13

In a class of 25 students, 20 have a brother and 8 have a sister. There are 3 students

Mathematics
1 answer:
kaheart [24]3 years ago
6 0

Answer: 6/8 or 3/4 or 0.75

Step-by-step explanation:

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The sevth term of a geometric sequence is 108 the eight term is 36 find the common ratio
ValentinkaMS [17]

Answer:

<h3><u>Required Answer</u><u>:</u><u>-</u></h3>

\sf t_8=108 \\ \sf t_7=36

  • Common difference=d

{:}\longrightarrow\sf d=t_8-t_7

{:}\longrightarrow\sf d=108-36

{:}\longrightarrow\sf d=72

7 0
3 years ago
Please please help. I have a bunch of these and I don’t understand it at all
shtirl [24]
The correct option is: Option (B) \sum_{i=1}^{7} (5i-2)

Explanation:

First thing is that the difference between each number in the series with the next number is 5. It means it must be the multiple of 5. There are two options that contain multiples of 5: Option B and Option D. Now in the option D, the upper limit is 6. If we put 6 in the expression: 5(6)-2, the last term would be 28. However in the series given in the question, the last term is 33. Hence 5(7) - 2 = 35 - 2 = 33 which is Option B.

When i=1: 5(1)-2 = 3
When i=2: 5(2)-2 = 8
When i=3: 5(3)-2 = 13
.
.
When i=7: 5(7)-2 = 35-2 = 33
Hence the correct option is (B).
3 0
3 years ago
A canoe traveled Downstream with the current and went a distance of 15 miles in three hours. On the return trip, the canoe trave
coldgirl [10]

Answer:

1 mile/hr

Step-by-step explanation:

Let the Speed of the boat still in water = a

Speed of the current = b

We know from this formula that speed = distance/time

Hence,

A canoe traveled Downstream with the current and went a distance of 15 miles in three hours.

Downstream = a + b = 15/3

a + b = 5 .........Equation 1

On the return trip, the canoe traveled Upstream against the current. It took 5 hours to make the return trip.

Upstream = a - b = 15/5

a - b = 3 ..............Equation 2

Combining both Equation together

a + b = 5 .........Equation 1

a - b = 3 ..............Equation 2

Subtracting Equation 2 from Equation 1

2b = 2

b = 2/2

b = 1miles/hr

Since b = speed of the current which can also be called rate of the current, the rate of the current = 1 miles/hr

4 0
3 years ago
Need help solving this
DedPeter [7]

Answer:

  x = (√21)/2

Step-by-step explanation:

The sides of a 30°-60°-90° triangle have the ratios 1 : √3 : 2. That means the middle-length side is (√3)/2 times the length of the longest side.

  x = (√3)/2·√7

  \boxed{x=\dfrac{\sqrt{21}}{2}}

8 0
2 years ago
I need help asap plz.
dangina [55]
X > 5
x = 5 is not a solution because x is always greater than 5.
3 0
3 years ago
Read 2 more answers
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