MATH SOLVE

3 months ago

Q:
# A regular lightbulb uses 20 watts less then twice the power of an energy-saver lightbulb. If the regular bulb uses 170 watts, how much does the energy-saver bulb use?

Accepted Solution

A:

The energy-saver bulb uses 95 wattsStep-by-step explanation:A regular light-bulb uses 20 watts less then twice the power of an energy-saver light-bulb. The regular bulb uses 170 wattsLet the energy-saver light-bulb uses x wattsThe regular light-bulb uses 20 watts less than twice the energy-sever light-bulbWe need to find how much the energy-saver bulb uses∵ The energy-saver light-bulb uses x watts∵ The regular light-bulb uses 20 watts less than twice the energy-sever light-bulb- Multiply x by 2 and subtract from the product 20∴ The regular light-bulb uses = 2 x - 20∵ The regular light-bulb uses 170 watts- Equate the two expressions of the regular light-bulb∴ 2 x - 20 = 170- Add 20 to both sides∴ 2 x = 190- Divide both sides by 2∴ x = 95 wattsThe energy-saver bulb uses 95 wattsLearn more:You can learn more about word problems in brainly.com/question/13174281#LearnwithBrainly