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nadya68 [22]
3 years ago
12

What is the answer to 420 + 69 =

Mathematics
2 answers:
Gelneren [198K]3 years ago
8 0

Answer:

420 + 69 = 489

Step-by-step explanation:

HOPE THIS HELPS

brainliest pls :)

harkovskaia [24]3 years ago
7 0

Answer:

489

Step-by-step explanation:

420 + 69 = 489

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1. The sum of first n terms of an arithmetic sequence is 3n²+4n
valentina_108 [34]

Answer:

<h3>           a.  a₁=7,     b.  a_n=7n+1,    c.  a₂₀=141</h3>

Step-by-step explanation:

a.

 a_1=S_1=3\cdot1^2+4\cdot1=3+4=7

b.

   a_1+a_2=S_2\\\\a_1+a_1+d=3\cdot2^2+4\cdot2\\\\7+7+d=3\cdot4+8\\\\14+d=12+8\\\\d=6\\\\\\a_n=a_1+d(n-1)\\\\a_n=7+6(n-1)\\\\a_n=7+6n-6\\\\\underline{a_n=7n+1}

c.

 a_{20}=7\cdot20+1=141

5 0
3 years ago
Please help and explain I don’t get it
VMariaS [17]
The answer is d, when you divide 45 by 54 you get 0.833333333333.... the line above the 3 means that there is infinite number of threes
3 0
3 years ago
Read 2 more answers
3 divided by 5/6=___
timofeeve [1]
The answer would be 3.6
8 0
4 years ago
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A mile is equal to 5280 feet.if the highway department places a reflector every 25 feet how many reflectors will there be in 1 m
murzikaleks [220]
5280/25, ignoring the remainder, equals 211. That's the answer
8 0
3 years ago
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Eliminate the parameter. x = t^2 + 1, y = t^2 - 1.
Maksim231197 [3]

Answer:

Eliminating the parameter, the equation is y = x - 2

Step-by-step explanation:

We are given the following parametric equations:

x = t^2 + 1

y = t^2 - 1

We want to eliminate the parameter t. From the first equation:

x = t^2 + 1

t^2 = x - 1

Replacing in the second equation:

y = x - 1 - 1

y = x - 2

Eliminating the parameter, the equation is y = x - 2

7 0
3 years ago
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