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3 years ago

Help please! Solve the proportion for x.

Mathematics

2 answers:

Dovator [93]3 years ago

8 0

1+3x /4= 5/2
1+3x = 5*4/2
1+3x =10
3x =9
x = 3

Paha777 [63]3 years ago

3 0

Make the denominators all the same.

LCM (4;2) = 4

$\frac{1+3x}{4} = \frac{10}{4}$

Multiply both fractions for 4 to delete denominators

1+3x = 10

Move know terms to the right with changed sign

3x = 10-1

3x = 9

Since the x is multiplied for 3, divide both terms for 3

3x/3 = 9/3

x = 3

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The top row says the first term is 8

The bottom row says that to get the nth term, we subtract 7 from the (n-1)th term. So basically we subtract 7 from each term to get the next term.

Note the subscripts tell us which term we're working with.

======================================================

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a(n) = a + d(n-1)

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Finding the 10th term

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