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hodyreva [135]
3 years ago
5

What is th he sum of the first seven terms of the series -3+6-12+24-...?

Mathematics
1 answer:
ohaa [14]3 years ago
5 0

Answer:

-129

Step-by-step explanation:

-3+6-12+24-48+96-192=

6+24+96-3-12-48-192=

126-255=

-129

Hope this helps!

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Cary is 7 years older than Dan. In 7 years the sum of their ages will be 79. Find the age of each man now.
Vilka [71]

Answer:

Dan is 29. Cary is 36.

Step-by-step explanation:

Let Dan's age now be D.

Let Cary's age now be C.

"Cary is 7 years older than Dan."

C = D + 7

"In 7 years the sum of their ages will be 79. "

In 7 years, the ages of Dan and Cary will be D + 7 and C + 7, respectively.

D + 7 + C + 7 = 79

C + D + 14 = 79

C + D = 65

C = D + 7

The last two equations in bold above form a system of equations. Since the second equation is already solved for C, we use the substitution method.

D + 7 + D = 65

2D + 7 = 65

2D = 58

D = 29

C = D + 7

C = 29 + 7

C = 36

Answer: Dan is 29. Cary is 36.

3 0
3 years ago
1. The expression 11x2 - 12x - 10 has ___ terms and a constant of ___.
Illusion [34]
1.  3,-10

2. 10x + y

3. 2x - 3y


6 0
3 years ago
Read 2 more answers
If m (AB = 120°, then which of the following have measures of 60°?
victus00 [196]
<span>∠BCA = 120 /2 = 60

answer
</span><span>∠BCA</span>
7 0
3 years ago
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Juan rides his bike 30 miles in 8 hours. At this rate how many miles does he ride his bike
irinina [24]

Answer:

answer is 7.5 miles

Step-by-step explanation:

30/8=3.75 mi in one hour

3.75*2=7.5 miles in 2 hours

hope it helps

6 0
3 years ago
Given the area of a square is 225 ft.² what is the length of each side
Vinvika [58]

Answer:

15ft

Step-by-step explanation:

the square root of 225 is 15, so the answer is 15ft

15×15=225

8 0
3 years ago
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