During their family vacation, Marcus took 18 photos on his cell phone, The ratio of the number of photos Marcus took to the number of photo his sister took 3 to 4. How many photos did his sister take? 6th grade math

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Lilianna uses 3/4 calories per minute just by sitting. she uses 1 more calorie per minute by walking. lilianna uses a total of 12 1/4 calories walking to the park. lilianna uses the equation, d(.75+1)=12.25 to represent the situation. what does the variable d represent in the equation?

Consider the set of all four-digit positive integers less than 2000 whose digits have a sum of 24. what is the median of this set of integers?