BRAINLIEST TO CORRECT PLEASE

3 6/4 or 18/4

Step-by-step explanation:

1 3/4+2 3/4= 1+2 and 3/4+3/4

1+2=3

3/4+3/4= (3+3= 6 )6/4

3+6/4= 3 6/4 or 18/4

STUDENTS MISTAKE:

they added the denominators

Their mistake was that they didn't add the denominators.

Here's a step by step solution correctly:

1. Add

a. Convert mixed number to improper fraction

1 3/4 = 1 x 4/4 + 3/4 = 4 + 3/ 4 = 7/4

b. Convert mixed number to improper fraction

2 3/4 = 2 x 4/4 + 3/4 = 8 + 3 / 4 = 11/4

c. Add

7/4 + 11/4 = 7+11/4 = 18/4

2. Simplify

18/4 = 9/2 = 4 1/2

a. Reduce fraction to lowest terms

18/4 = 18 ÷ 2/4 ÷ 2 = 9/2

2 is the greatest common divisor of 18 and 4. Reduce by dividing both numerator and denominator by 2.

b. Convert improper fraction to mixed number

9/2 = 4 1/2

9 ÷ 2 = 4 remainder 1

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first, we define the variables:

x: number of years after 1950

f (x): amount of vinyl sold.

then, with the variables defined, we have:

68594 vinyl records were sold in 1958 > f (8) = 68594

91299 vinyl records were sold in 1961 > f (11) = 91299

38720 vinyl records were sold in 1952 > f (2) = 38720

161743 vinyl records were sold in 1967 > f (17) = 161743

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step-by-step explanation: