If a the base on a logarithum is blank is it 1,0, or 10

A high speed train can travel an average of 500km in 2 hours. If it left its station at noon and traveled nonstop, how many kilometers had it traveled by midnight. A. 1,500km B. 3,000km C. 6,000km D. 12,000km

Solve, showing all steps: 5 (x - 3) - 2 (2x + 4) = - 2 (x - 2)

Explain why or why not 12.702 is a reasonable value for the expression 5.8 * 2.19

Using metal Evelyn is making a costume for her school play he needs to buy 2 yards of cotton fabric at the cost of $3.49 per yard and 1/2 yard of sand satin fabric at 5.98 per yard she has $15 to spend on fabric. Will she have enough money

3. What is the frequency of a wave that has a wave speed of 20 m/s and a wavelength of 0.50 m?

Gavin's anemometer measures the wind speed at 44.14 kilometers per hour. 4 times the wind speed 5 hours ago. What was the wind speed 5 hours ago?

Find the next three terms in the numbers sequence 3,10,19,26,_,_,_.

Simplify the expression cosxcscxtanx

Simplify (2^3) ^-2. 1) - (1/64) 2) 1/64 3) 2 4) 64

And is currently h years old. Bill is currently 2h years old and Charles is currently eight years old. Find an expression for each person's age after h years. Then find an expression for the sum of their ages after h years.