Precision 2x

Need help with Geometry?
Find the precision for each measurement. Explain its meaning.
1) 80 inches
2) 16 1/2 inches
Find the measurement of each segment
3) WX
the line segment is WXY and they're all 4.8cm
Find the value of the variable and ST if S is between R and T
5) RS=2x, ST=3x, R5=25
6) RS=3y+1, ST=2y, RT=21
Please help me...I dont get these five problems.
80 inches appears to be to the nearest ten inches; the precision is half of that so 5 inches. You know the actual measure is within 5 inches of 80 since anything more than 5 inches above would have rounded up to 90 and anything more than 5 below would have rounded down to 70.
For 16 1/2, that's to the nearest 1/2 inch so half of 1/2 inch is 1/4 inch precision
Not sure what you mean on 3
5 and 6, since they go RST, RS + ST = RT
so 2x + 3x = 25
5x = 25
x = 5
3y + 1 + 2y = 21
5y + 1 = 21
5y = 20
y = 4
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