03/14/19

How is the mass of the Earth determined?
According to textbook knowledge, the mass of the Earth is about $6 × 10^{24}\\,\\mathrm{kg}$. How is this number determined when one cannot just weight the Earth using regular scales?
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03/14/19

Use Gauss-Jordan row reduction

Use Gauss-Jordan row reduction to solve the given system of equations. HINT [See Examples 1-6.] (If there is no solution, enter NO SOLUTION. If the system is dependent, express your answer in terms... more
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03/12/19

Forgot Compounding Formula

What's the formula for finding the sum of a range of numbers that increase 1 integer and continues example - starting at 20 through 60 what's the total of the numbers added ie. 20+21+22+23.....+60
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03/12/19

The mean for your data set is 13. The standard deviation is 2.5. What is the z-score for 10?
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03/11/19

-2[ln(x-6)^-1]≤-3
Solve the inequality. Round to the nearest ten-thousandth.
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03/11/19

how to find dy/dx.
y= ln x6 + log 3 x - 10 ex + 5x
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03/10/19

What is k such that y= (x+5)/(x+k) is the inverse of itself
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03/09/19

How do I solve the system by the method of substitution?
Solve {-x-y=-7, x^2-y=-5
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03/09/19

Sam can do a job in 3 hours, Bill can do the same job in 9 hours. How long does it take them to do the job together?
I need the answer of how long it will take them to do it together
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03/09/19

An oriental rug has an area of 448 square feet. Its length is 4 feet more than twice its width. Find the dimensions of the rug
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03/09/19

A washer and a dryer cost $ 830 combined. The washer costs $ 80 more than the dryer. What is the cost of the dryer?

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03/08/19

Dave put $22,000 in an investment that is compounded yearly at a rate of 7%. The investment is over a 15-year period. What is the amount of Dave’s total investment?
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03/07/19

Working alone, Jenny can mop a warehouse in 10 hours. One day her friend Carlos helps her and it only took 5.24 hours. How long would it take Carlos to do it alone?
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03/07/19

If 1 inch represents 40 miles on a map then how many inches will represent 230 miles

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03/07/19

Help pleaseeeee
Calvin runs 3/5 mile in seven minutes. How many miles does he run in one minute. Have to show work
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03/07/19

The length of a rectangle is 8 more than the width. The area is 209 square yards. Find the length and width of rectangle
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03/07/19

Can you solve this?
As a town gets​ smaller, the population of its high school decreases by 5​% each year. The senior class has 250 students now. In how many years will it have about 100 ​students? Write an equation.
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03/06/19

one number added to three times another number is 24. five times the first number added to three times the other number is 36 find the numbers.
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03/06/19

Word problem help
A cubic meter of concrete mix contains 420 kg of cement, 150 kg of stone, and 120 kg of sand. What is the total weight of a cubic meter of the mix? What fractional part is cement? Stone? Sand? At... more
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03/06/19

Linear Equation

Pure acid is to be added to a 10% acid solution to obtain 90L of 37% solution. What amount of each should be used?
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03/06/19

Solving a percent mixture problem
Two factory plants are making TV panels. Yesterday, Plant A produced twice as many panels as Plant B. Three percent of the panels from Plant A and 4% of the panels from Plant B were defective. How... more
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03/06/19

i need help with a math word problem
At the end of the school year, Rachel and Amber go to the roof of a 12-story building and throw their Algebra book of the edge. The equation of the pathway that each girl’s textbook takes is given... more
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03/05/19

please help me math
A store is having a sale on jelly beans and almonds. For 2 pounds of jelly beans and 3 pounds of almonds, the total cost is $10. For 6pounds of jelly beans and 5 pounds of almonds, the total cost... more
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03/05/19

You want to buy a $218,000 home. You plan to pay 5% as a down payment, and take out a 30 year loan for the rest.
a) How much is the loan amount going to be?b) What will your monthly payments be if the interest rate is 5%?c) What will your monthly payments be if the interest rate is 6%?
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03/05/19

The function v(t)=6000(1.08)^t gives the value, V, of an investment t years after the initial investment. How many years until the value of the investment doubles?
im having a real hard time since its not compound continuously, im not sure where to start.
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