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trasher [3.6K]
3 years ago
12

Which expression defines the given series for seven terms? 8 + 13 + 18 + . . .

Mathematics
1 answer:
almond37 [142]3 years ago
7 0

The given question is 8+13+18+...... which is in arithmetic progression . And for arithmetic series, we have to use the following formula for nth term .

a_{n} = a + (n-1)d

Here a =8 , d=5

So we get

a_{n} = 8+(n-1)5 = 5n +3

And the required expression for n=7 is

\sum_{n=1}^{7}(5n+3)

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Do the ratios 2:4 and 5:10 form a proportion?<br> yes or no
Kisachek [45]

Answer:

Yes, the ratios do form a proportion.

5 0
2 years ago
Someone help me plz.
Svetllana [295]
Answer:
20%

Explanation:
What we know:
- there are 25 cans in total
- 5 of them are root beer cans

Using this information, we can say that 5/25 cans are root beer cans. To find the percent, we change the fraction into a decimal and then multiply it by 100.

To change 5/25 into a decimal, we divide the numerator and denominator.
5/25=0.2

And we multiply the decimal by 100 to get the percent:
0.2*100=20

Therefore, 20% of Cam’s cans are root beer cans.

I hope this helps!
3 0
3 years ago
Use the figure to find measures of the numbered angles.
Dafna1 [17]

Answer:

1 = 137

2 = 43

3 = 43

4 = 137

Step-by-step explanation:

for the first line, do (180-137 = 43)

then, 43 would be corresponding angle to 2 - making them equal

2 would be vertically opposite to 3, making them equal

137 and 1 are corresponding- making them equal

4 is vertically opposite to 1 - making them equal

8 0
3 years ago
Read 2 more answers
The ratio of boys to girls at a daycare is 5 to 4 which of these cannot be the total number of kids at the daycare ?
Andre45 [30]
I believe the answer is D
6 0
3 years ago
How do I find the missing value
liberstina [14]
Okay. Since the "y" value and 82* are on the same straight line, their values will always add up to make a sum of 180. So if you subtract 82 from 180 you get 98*. So your "y" value is equal to 98*.

Now, all of the degree values added together should give you a sum of 360, so now we must add the values we know, in order to find the "x" value. So, 112*+82*+98*=292. Now we know that the difference of 360 and 292 will give us the x value. So finally, 360-292=68. So your "x" value is equal to 68.

y=98
x=68
6 0
3 years ago
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