Tutors Answer Your Questions about Expressions-with-variables (FREE)
Question 192809: Given Year 1, Year 2, Year 3, with an average between all three of $2,400,000. Year 2 has a 4% increase over Year 1 and Year 3 has a 4% increase over Year 2, what is the dollar amount for each year?
Does anyone know how to work this out? Your help would be greatly appreciated.
Click here to see answer by edjones(7569)   |
Question 192808: Given Year 1, Year 2, Year 3, with an average between all three of $2,400,000. Year 2 has a 4% increase over Year 1 and Year 3 has a 4% increase over Year 2, what is the dollar amount for each year?
Does anyone know how to solve this, the answer cannot be "x" because I need the number to be able to work through the rest of the problem. Your help would be greatly appreciated thank you!
Click here to see answer by edjones(7569) |
Question 191164: Please help me solve this substitution problem.
3(x-y)=15
2x+y=7
The question I have is does it matter which equation I use as the substitution? I used the 2nd equation and came up with a different answer than with the first.
First solution:
3(x-y)=15
2x+y=7 y=7-2x
3(x-7-2x)=15
3x-21-6x=15
-3x=36
x=-12
y=7-2x
y=7-2(-12)
y=31
Second solution:
3(x-y)=15 3x-3y=15
2x+y=7 3x=15+3y
x=5+y
2(5+y)+y=7
10+2y+y=7
3y=-3
y=-1
x=5+y
x=5+-1
x=4
which is correct and how do I know which equation to start with on these types of problems?
Click here to see answer by MathTherapy(1484)  |
Question 193223: Could you please help me with this question?
Two cars travel toward each other from cities that are 945km. apart at rates of 120km/hr and 90 km/hr. They started at the same time. In how many hours will they meet?
Thank you for your help.
Click here to see answer by jonvaliente(64)  |
Question 194899: I'm very confused about this problem, so I really hope someone can help me. I dont know how to type this and I looked at the fourmula plotting system but couldnt find anything, so I will try to explain it the best I can.
I have to write an expression for the following.
y+y+...+y
(then there is a curly bracket under it making it look like a fraction(except that its a curly bracket) and under the bracket is the following)
x of them
Click here to see answer by jim_thompson5910(28717) |
Question 195270: Without drawing the graph of the equation, determine how many points the parabola has in common with the x-axis and whether its vertex lies above, on, or below the x-axis.
y = 2x^2 + x + 3
Click here to see answer by J2R2R(94)  |
Question 195647: . Forensics. A forensic scientist uses the expression
72.6 + 2.5T to estimate the height in centimeters of a
female with a tibia of length T centimeters. If a female
skeleton has a tibia of length 32.4 cm, then what was the
height of the person? Find the length of your tibia in centimeters,
and use the expression from this exercise or the
previous exercise to estimate your height.
Click here to see answer by jim_thompson5910(28717) |
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