Questions in mathematics

Questions in mathematics

[Done] About \(\frac{6}{8}\) of the Earth's surface is covered by water. About what fraction of the Earth's surface is not covered by water?

[Done] Simplify the expression: \[ 8 - 3(6 - 6a) \]

[Done] 1) \[ 5x - 2y = 4 \] 2) \[ 3x - 5y = 13 \] \[ x - 2y = 5 \] \[ 3x + y = 9 \]

[Done] A dime is tossed and then a quarter is tossed. One possible outcome is dime: heads, quarter: tails. What are the three other outcomes? 1. Dime: heads, quarter: heads 2. Dime: tails, quarter: heads 3. Dime: tails, quarter: tails

[Done] 4 times what equals 276?

[Done] Your family takes a taxi from the airport to your hotel. The total charge for the ride is $38.55. How much should you give the cab driver as a tip if you want the tip to be about 15%?

[Done] Solve the system by substitution: 1. \( y = 3x - 20 \) 2. \( y = -x^2 + 34 \)

[Done] Which is greater? 1. \(\frac{11}{6}\) or \(\frac{3}{4}\) 2. \(\frac{1}{2}\) or \(\frac{8}{31}\) 3. \(\frac{3}{4}\) or \(\frac{3}{5}\) 4. \(\frac{5}{7}\) or \(\frac{4}{9}\)

[Done] What is a number that is less than 3000, and when divided by 32, leaves a remainder of 30, and when divided by 58, leaves a remainder of 44?

[Done] Write \(\frac{51}{12}\) as a mixed number in simplest form.