1,070 Answered Questions for the topic Math Equations

Math Equations

04/17/13

#### If the width of a rectangle is 8 inches and its perimeter is 42 inches, find the length of the rectangle.

The length of the rectangle is what in inches?

Math Equations

04/17/13

#### A barrel contains 190 gallons of water and is being drained at a constant rate of 14 gallons per hour.

Type an equation that models the number of gallons, g, after t hours
The equation that models the given situation is ?

Math Equations

04/17/13

#### An investor invested a total of $2,100 in two mutual funds.

One fund earned a 6% profit while the other earned a 2% profit. If the investor's total profit was $74, how much was invested in each mutual fund?
The amount invested in the mutual fund that...
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Math Equations

04/17/13

#### Use symbols to write the expression and then evaluate it.

Four squared divided by two to the fourth power.
(Type exponential notation with positive exponents.)

Math Equations

04/17/13

#### The cost of driving a car includes both fixed costs and mileage costs.

Assume that it costs $171.90 per month for insurance and car payments and $0.27 per mile for gasoline, oil, and routine maintenance.
(a) Find values for m and b so that y=mx+b models the monthly...
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Math Equations

04/17/13

#### The number N of state and federal inmates in millions during year x,

Where x>2002 can be approximated by the following formula.
N=0.05x-99.05
Determine the year in which there were 1.2 million inmates.
It was in the year ?

Math Equations

04/17/13

#### Use the method of substitution to solve the system of linear equations.

4x-y=2
9x-2y=7
The solution is what? (Type an ordered pair.)

Math Equations

04/17/13

#### Use the distributive property to rewrite the expression.

(a+3)5= (Simplify your answer.)

Math Equations

04/17/13

#### Use the elimination method to solve the system of equations.

a+8b=3
a+2b=-3
Select the correct choice below and if a is the correct choice write out the answer and simplify your answer and write an ordered pair again only if a is the correct answer.
(a)...
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Math Equations

04/17/13

#### Write the function as a set of ordered pairs. Give the domain and range of f.

f(a)=t, f(b)=p, f(c)=r, f(d)=t
f=? (Type ordered pairs. Use a comma to separate answers as needed.)
Domain is ? (Type ordered pairs. Use a comma to separate answers as needed.)
The range is ?...
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Math Equations

04/17/13

#### Translate the pharse into a mathmatical expression and than simplify.

Seven times a number decreased by twice the same number.
(a) Write the corresponding mathematical expression. (Type an expression using x as the variable do not simplify.)
(b) The simplified...
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Math Equations

04/17/13

#### Using the formula A=lw, find the area of the rectangle

The length and width given are 2x^3 and 4x^3
The area is what? (Type a simplified exponential expression.)

Math Equations

04/17/13

#### Use the formula d=rt to find the value of the missing variable.

d=195 feet, t=39 seconds
r=what in feet/seconds?

Math Equations

04/17/13

#### Parking in a student lot costs $1 for the first half hr and $1.50 for each hr thereafter.

A partial HR is charged the same as a full HR. What is the longest time that a student can park in this lot for $9? (Simplify your answer.)

Math Equations

04/17/13

#### The table lists the percentages of household that were 3-person households during selected year.

Year: 1970 1980 1990 2000
Percentage: 17.3 17.5 17.5 16.6
(a) What was this percentage in 2000? (Type an...
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Math Equations

04/17/13

#### Find the slope-intecept form for the line satisfying the following conditions.

x-intercept 3, y-intercept 1/5
(Type an equation. Use integers or fractions for any numbers in the equation.)

Math Equations

04/17/13

#### Find the slope, if it exists, of the line containing the pair of points.

(-19, -7) and (-20, -8)
Select the correct choice below and if necessary, type out the answer to complete your choice.
(a) The slope is ?
(b) The slope is undefined.

Math Equations

04/17/13

#### Simplify the expression

0.5x^2+0.4x^2-0.2x^2
(Use integers or decimals for any numbers in the expression.)

Math Equations

04/17/13

#### A certain mountain has an elevation of 19,545 feet.

In 1918, the glacier on this peak covered 9 acres. By 2002 this glacier had melted to only 1 acre.
(a) Assume that this glacier melted at a constant rate each year find this yearly rate? (Type a...
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Math Equations

04/12/13

#### A family refers to a group of two or more people related by birth, marriage, or adoption who reside together.

In 2000, in Country A, the average family net worth was $410,000, and there was about 6.1 x 10^7 families. Calculate the total family net worth Country A in 2000.
Country A's total family net...
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Math Equations

04/12/13

#### Evaluate the expression. Write the answer in standard form.

(-4 x 10^-6) (2 x 10^4) =?

Math Equations

04/12/13

#### A moon is about 240,000 miles from the planet orbits.

(a) Write this number in scientific notation.
(b) If a rocket at 6 x 10^4 miles per hour, how long would it take for it to reach the moon from the planet.
(Use the multiplication symbol in the...
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