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SVETLANKA909090 [29]
3 years ago
14

Solve the equation 25=7+r

Mathematics
1 answer:
anyanavicka [17]3 years ago
8 0

Answer:

r = 18

Step-by-step explanation:

Subtract the seven from both sides

25 -7 = 7 - 7 + r

18 = r

Simple as that!

Hope this helps!

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If the 4th and 7th terms of a GP are 250 and 31250 respectively. Find the two possible values of a and r
Over [174]

Answer:

a = 2, r = 5

Step-by-step explanation:

Nth term of a GP = a×r^(n-1)

Where 'a' is the first term and 'r' is the common ratio

4th term = a×r^3 = 250

r^3 = 250/a

7th term = a×r^6 = 31250

a×r^6 = 31250

a×(r^3)^2 = 31250

a×(250/a)^2 = 31250

a×(62500/a^2) = 31250

62500/a = 31250

a = 62500/31250 = 2

a = 2

since r^3 = 250/a,

r^3 = 250/2 = 125

r = (125)^(1/3)

r = 5

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3 years ago
34.75 divided by 5 equals what
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Answer:

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Step-by-step explanation:

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What is the radius of a semi circle when the area is 20cm
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 hello : 
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