Posted by **allen** on Tuesday, November 27, 2007 at 6:58pm.

please check my answers

Suppose that the temperature outside is dropping at a constant rate. At noon, the temperature is 70 F and it drops to 58 F at 5 p.m. How much did the temperature change each hour?

12/5=2.4 degrees per hour.

Evaluate the expression if a=-2, b=5,c=-4, and d=6:4b+5d-c/a

4b+5d-c/a =

4(5)+5(6)-(-4)/(-2)

4x5=20

5x6=30

-4/-2=2

answer= 20+30+2=52

Evaluate the expression if a=-2, b=5,c=-4, and d=6: 6^2-2bc+c^2

---> 5² - 2(5)(-4) + (-4)²

= 25 + 40 + 16

= 81

The simple interest I on a principle of P dollars at interest rate r for time t, in years, is given by I=Prt. Find the simple interest on a principle of $6000 at 3% for 2 years. (Hint: 3%=0.03)

Interest = 6000*.03*2

Simplify using the distributive property:7(4w-3)-25=

-21+25w+28w=

-21+3w

A triangle has sides 3x+7, 4x-9, and 5x+6. Find the expression that represents the perimeter.

=3x + 7+ 4x - 9+5x +6

=3x+4x+5x +7-9+6

=12x-3

Simplify, if possible: 6x^2y^3+9x^2y^3/3x^2y^2

- math/algebra -
**Michael**, Tuesday, November 27, 2007 at 7:08pm
The temperature one is correct. You may want to include a negative sign to indicate that the temperature is dropping.

You made a sign mistake on the first evaluation. (You dropped one of your negative signs.)

On the second evaluation, you changed "6^2" to "5^2" in your work.

For the simple interest, you should multiply what you have to get a numerical answer in dollars.

Your distributive property problem is quite wrong. The distributive property states for an expression a(b+c), the answer will be ab + ac. Try to apply that to your problem.

On the perimeter, check 7-9+6. It's not -3.

- math/algebra -
**Dashauna**, Thursday, March 25, 2010 at 2:16pm
-x+2y=3

3x+2y=-1

## Answer this Question

## Related Questions

- algebra - Suppose the temperature outside is dropping at a constant rate. At ...
- 8th Grade Math - The temperature in Toronto at noon during a winter day measured...
- math - Please help me on this calculus question. I am getting the wrong diff. ...
- 3 grade math - 1- at 12 noon, leslie recorded the temperature as 56F. the ...
- Algebra (math) - The temperature outside was 72 degrees at 6 am. The temperature...
- 8th Grade Math - The temperature in Toronto at noon during a winter day measured...
- Math - The temperature at noon is 75 degreesF. The temperature drops 3 degrees ...
- Algebra 1 - The temperature outside was 72 degrees at 6 am. The temperature rose...
- Temperature(Math) - At 5 o'clock in the morning, the temperature at the top of ...
- Math_ Intergers - On Tuesday teh temperature changes -2 degrees F perhour from ...

More Related Questions