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aksik [14]
3 years ago
9

Im confused please help

Mathematics
2 answers:
ExtremeBDS [4]3 years ago
8 0

Answer:

A

Step-by-step explanation:

irina1246 [14]3 years ago
6 0

Answer:

its a

Step-by-step explanation:

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What property was applied to solve the equation below?
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"Find the sum of the first 50 term in this sequence 4, 7, 10, 13, ...". How do i do this without writing them all out, and how d
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First term ,a=4 , common difference =4-7=-3, n =50
sum of first 50terms= (50/2)[2×4+(50-1)(-3)]
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derivation of the formula for the sum of n terms
Progression, S
S=a1+a2+a3+a4+...+an

S=a1+(a1+d)+(a1+2d)+(a1+3d)+...+[a1+(n−1)d]   →   Equation (1)

S=an+an−1+an−2+an−3+...+a1

S=an+(an−d)+(an−2d)+(an−3d)+...+[an−(n−1)d]   →   Equation (2)

Add Equations (1) and (2)
2S=(a1+an)+(a1+an)+(a1+an)+(a1+an)+...+(a1+an)

2S=n(a1+an)
S=n/2(a1+an)

Substitute an = a1 + (n - 1)d to the above equation, we have
S=n/2{a1+[a1+(n−1)d]}
S=n/2[2a1+(n−1)d]
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3 years ago
Find the surface area of this rectangular prism: Don't forget to show the unit of measure.
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See Explanation

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The question is incomplete as the attachment of the prism is not given.

From the attachment:

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Jeremy wants to buy a backpack that costs $65. Luckily, the store is having a 35% off sale. What will be the sale price of the b
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Answer:

42.25

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65-22.75=42.25

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