47,737 Answered Questions for the topic Math
the ratio of “D”s to “A”s in the school was 8 to 21. If there were 572 in the school this term, how many Ds were there ?
the ratio of “D”s to “A”s in the school was 8 to 21. If there were 572 in the school this term, how many Ss were there ?
Another solving a quadratic equation by completing the square: Exact answers
Solve the quadratic equation by completing the square.x^2 - 8x + 2 = 0First, choose the appropriate form and fill in the blanks with the correct numbers.Then, solve the equation. If there is more... more
Another writing equations of lines parallel and perpendicular to a given line through a point
Consider the line y=7x-7Find the equation of the line that is perpendicular to this line and passes through the point (−3, 6)Find the equation of the line that is parallel to this line and passes... more
Another word problem involving the maximum or minimum of a quadratic function
A ball is thrown vertically upward. After t seconds, its height h (in feet) is given by the functionWhat is the maximum height that the ball will reach? Do not round your answer.
How do I classify numbers?
As in integers, irrational numbers, whole numbers and rational numbers?
Word problem involving the maximum or minimum of a quadratic function
A vehicle factory manufactures cars. The unit cost C (the cost in dollars to make each car) depends on the number of cars made. If x cars are made, then the unit cost is given by the function How... more
Writing equations of lines parallel and perpendicular to a given line through a point
Consider the line Find the equation of the line that is parallel to this line and passes through the point (5, 3)Find the equation of the line that is perpendicular to this line and passes through... more
Graph the function (please help)
Graph the functionPlot five points on the graph of the function, as follows. Plot the first point using the x-value that satisfies Plot two points to the left and two points to the right of the... more
Solve the quadratic equation by completing the square
Solve the quadratic equation by completing the square. x^2 + 2x -6 = 0 First, choose the appropriate form and fill in the blanks with the correct numbers. Then, solve the equation. If there is more... more
Please help with this math problem. -4.9t2 isn’t squared.
A baseball player swings and hits a pop fly straight up in the air to the catcher. The height of the baseball in meters is t seconds after the hit is given by the quadratic function h(t) = −4.9t2 +... more
Math Algebra 1
Part 1: Graph piecewise functions from tables and equations.
Isabel’s competition,who sells books and no other products, charges a shipping fee of $1.99 per book plus a fixed fee of $3 for each order. Let x be the number of books purchased and f(x) be the... more
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You have prepared a solution by dissolving 73.15mg of sucrose (table sugar, C12H22O11) in 1.55kg of water. What is this solution's sucrose concentration in parts per million, ppm? (show steps)
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You have prepared a solution by dissolving 2.709g of nickel(II) chloride tetrahydrate in 60.0mL of water. What is this solution's chloride ion concentration in molality, m? (show steps)
The average teacher's salary in North Dakota is $35,441. Assume a normal distribution with =σ$5100. Round the final answers to at least 4 decimal places and round intermediate z-value calculations... more
if 4x^3+ax^2+8x-3 and f(2) =5 what is the value of a
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a student missed 13 problems on a math test and received a grade of 80%. if all problems were of equal value , how many questions were on the test?
find the maximum area of a rectangle inscribed in the region bounded by the graph of y=(4-x)/(5+x) and the axes.
Assume that the mean systolic blood pressure of normal adults is 120millimeters of mercury (mmHg) and the standard deviation is 5.6. Assume the variable is normally distributed. Round the answers... more
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It can take 12 hours to fill a swimming pool using two pipes. If the pipe of the larger diameter is used for 4 hours and that with the smaller diameter is used for 9 hours only half the pool is... more
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How much heat is required to warm 35.21g of liquid water at 88.53°C to steam (gaseous water) at 124.67°C?Specific Heat (ice) = 37.6 J/K*mol; Specific Heat (water) = 75.3 J/K*mol; Specific Heat... more
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The enthalpy of fusion for aluminum metal is 10.9kJ/mol. How much heat is required to melt 9.75g of solid aluminum metal at its melting point? Report your answer in units of kJ. (Show steps)
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The enthalpy of vaporization for chlorine is 20.41kJ/mol. How much heat is required to vaporize 223.05g of chlorine liquid at its boiling point? Report your answer in units of kJ. ( show steps)