Answers edited by Victor

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• A radioactive substance has a half life of 120 years. Presently, there are 60 grams of the substance. When were 600 grams present?
  
• Question #de480
  
• How many days?
  
• 145% of what number is 870?
  
• Question #99086
  
• Five less than 6 times a number is the same as the number plus 10. What is the number?
  
• Question #470d9
  
• How do you simplify #(z ^ { \frac { 1} { 3} } \cdot x ^ { - 2} ) ^ { \frac { 5} { 3} }#?
  
• Question #01dd5
  
• How do you evaluate #-7( - 2.4) + 6( - 7.4)#?
  
• How do you add #\frac { 1} { 4} + \frac { 1} { 16} + \frac { 5} { 16} + \frac { 3} { 8}#?
  
• Question #d72d4
  
• Question #2ed16
  
• How do you simplify #\frac { 3v ^ { 2} + 20v + 25} { 3v + 5}#?
  
• Question #ddb76
  
• Dan is twice the height of his sister Julie plus four inches. Dan is 72 inches tall. How tall is Julie?
  
• Question #7e5f1
  
• How do you subtract #9/( y + 1) - 3/ ( 4y + 4)#?
  
• You are traveling on the interstate highway at a speed of 65 mph. What is your speed in km/h?
  
• How do you evaluate #(0.8x ^ { 9} ) ( 0.1x ^ { 2} )#?
  
• A number is composed of 4 thousands and 21 tens. What's the number?