# algebra

A homeowner wishes to insulate her attic with fiberglass insulation to
conserve energy. The insulation comes in 40-cm wide rolls that are cut to fit between the rafters in the attic. If the roof is 6 m from peak to eave and the attic space is 2 m high at the peak, how long does each of the pieces of insulation need to be?
Round to the nearest tenth.

if the roof of the house is 7 m from peak to eave and the attic space is 3 m high at the peak, how long does each of the pieces of insulation need to be? Round to the nearest tenth.

I think you use the Pythagorean theorem. I got:

7sq = 3sq + b sq
49 = 9 + b sq
49-9=40
b = 40
after this I'm lost. what is the sq rt of 40? do I need to multiply this by 2?
pls help!!

Put this in the Google search window:

sqrt(40)

(Google has a nice calculator built in. No, don't multipy it by 2. You only do ones side at a time.

so, I got sqrt40 = 6.32
does that mean that each piece of insulation needs to be 6.32 m ?

yes, that is the length of the piece from the eave to the ridge.

yes, that is the length of the piece from the eave to the ridge.

1. 👍 0
2. 👎 0
3. 👁 115

## Similar Questions

1. ### algebra

A homeowner wishes to insulate her attic with fiberglass insulation to conserve energy. The insulation comes in 40cm wide rolls that are cut to fit between the rafters in the attic. If the roof is 6m from peak to eave and the

asked by Brandy on November 5, 2010
2. ### Algebra

A homeowner wishes to insulate her attic with fiberglass insulation to conserve energy. The insulation comes in 40-cm wide rolls that are cut to fit between the rafters in the attic. If the roof is 6 m from peak to eave and the

asked by Micha on October 1, 2007
3. ### algebra

A homeowner wishes to insulate her attic with fiberglass insulation to conserve energy. The insulation comes in 40-cm wide rolls that are cut to fit between the rafters in the attic.if the roof is 7 m from peak to eave and the

asked by allen on May 4, 2007
4. ### physics

The R-factor for housing insulation gives the thermal resistance in units of ft2 °F h/BTU. A good wall for harsh climates, corresponding to about 10 in of fiberglass, has R = 39 ft2 °F h/BTU. a) Determine the thermal resistance

asked by mehmet kaya on November 18, 2014
5. ### physics

The R-factor for housing insulation gives the thermal resistance in units of ft2 °F h/BTU. A good wall for harsh climates, corresponding to about 10 in of fiberglass, has R = 45 ft2 °F h/BTU. a) Determine the thermal resistance

asked by Anonymous on November 12, 2014
6. ### math

You are thinking of making your mansion more energy efficient by replacing some of the light bulbs with compact fluorescent bulbs, and insulating part or all of your exterior walls. Each compact fluorescent light bulb costs \$4 and

asked by LIZ on January 28, 2011
7. ### MATH

A collar of Styrofoam is made to insulate a pipe. Find its volume The large radius is to the outer rim. The small radius r is to the edge of the insulation. Use π for 3.14. r = 3 in R = 5 in h = 18 in. Round 2 decimal places

8. ### science

science questions:Look around your house and make a list o different kinds of containers that use insulation to keep foods hot or cold. If possible, describe the type of insulators used in each container. I don't know which

asked by Mariam on May 12, 2015
9. ### Calc

A metal cable has radius r and is covered by insulation, so that the distance from the center of the cable to the exterior of the insulation is R. The velocity v of an electrical impulse in the cable is v = -C(r/R)^2*ln(r/R) where

asked by Greg on December 2, 2009
10. ### Statistics

A quality control engineer is interested in the mean length of sheet insulation being cut automatically by machine. The desired length of the insulation is 12 ft. It is known that the standard deviation in the cutting length is

asked by Student on August 10, 2008

More Similar Questions