Final answer:
The equation to find the number of sugar cookies June baked is a) 35 + s = 65. By solving for 's' in the equation, we can determine that June baked 30 sugar cookies.
Step-by-step explanation:
The equation that represents how to find out how many cookies June baked when Jamie baked 35 chocolate chip cookies and together they baked a total of 65 cookies is a) 35 + s = 65. This is because you would add the number of cookies Jamie baked (35) to the number of cookies June baked (s) to find the total (65). So the equation to find 's' (the number of sugar cookies June baked) would be:
35 + s = 65
Subtracting 35 from both sides of the equation gives us:
s = 65 - 35
s = 30
Therefore, June baked 30 sugar cookies.