21. Shien went to a coffee shop and bought a cookie that cost $3 and a muffin. If the muffin cost m dollars, which expression represents the total amount that Shien spent at the coffee shop?
3 + m
22. Subtract. 41.239 - 4.588
36.651
23. What is the surface area of a cube with a side length of 3/4 inch? Use the expression 6s^2, where s is the side length of the cube.
3 3/8 square inches
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