Idon't need a step by step i just want the answer so i can double check my final answer.
marcos drove twice as far as candice. together, they drove 66 miles. which equation can be used to find the number of miles candice drove?

a) 3x = 66
b) 2x + 1/2x = 66
c) 3x = 66 + x
d) 3x = 66 - x

What value is equivalent to 5 + [5 × (4 + 2)]? a) 35 b) 45 c) 60 d) 110

The average human heart beats 1.15 \cdot 10^51.15⋅10 5 1, point, 15, dot, 10, start superscript, 5, end superscript times per day. there are 3.65 \cdot 10^23.65⋅10 2 3, point, 65, dot, 10, start superscript, 2, end superscript days in one year.how many times does the heart beat in one year? write your answer in scientific notation, and round to one decimal place.

The lines shown below are parallel. if the green line has a slope of -1, what is the slope of the red line?