Estimate the sum or difference?

6/10 + 7/12

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The cross-sectional area of a hole is 725 cm². Given that the area of a circle is A = πr², find the radiusof that hole.

What's the standard form of the line that passes through (7,-3) and has a y-intercept of 2?

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What is a sum for 4/3.

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Which of the following are mathematical sentences? A. 10r B. 6r C. 61 D. x=12 E. 9g=45 F. r+9=6