Why is it important to use significant digits to round the answer

In a negatively skewed distribution of exam scores, Tom scored at the mean, Mary scored at the median, and Jane scored at the mode. Who had the highest score?

If x = - 2 and y = 3, by how much does 2y^2 - x exceed 2x^2 - y? A) 5 B) 11 C) 15 D) 27 E) 31

What is the average height of a 12 year old asian boy?

The base of a triangle is twice its hypotenuse, the sine of the angle opposite to its base is a) Ö3/2, b) 1, c) 1/2, d) Ö3

Adding multiples tens and some ones 43+12=

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What is 8 times as many as 6

Is 0.7 greater than less than or equal to 7/9 show your work!

The scale drawing of a flower bed has the dimensions of 3 inches by 7 inches. The dimensions of the actual flower bed are 36 inches by 84 inches. What is the scale factor used to find the dimensions of the drawing?

What is the equation of the line in standard form which has slope - 2/5 and y-intercept 10?