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Questions (16)

the length of a rectangle is twice its width, the area is 72sq inches,find its dimensions(find length and width)
1. 2 answers
2. 452 views
find two even integers(numbers) so that the square of the smaller is 10 more than the larger one
1. 1 answer
2. 368 views
what is the quadratic equation?
1. 1 answer
2. 391 views
A filament lamp-cost- 80p effiency- 0.2 expected life- 1000 hours a compact fluorescent lamp (CFL)- cost- £3.00 effiency- 0.8
1. 0 answers
2. 994 views
which of the following are non- polluting:renewable sources coal nuclear fuels or oil?
1. 1 answer
2. 412 views
1A)A filament lamp- cost- 80p effiency- 0.2 expected life- 1000 hours a compact fluorescent lamp (CFL)- cost- £3.00 effiency-
1. 0 answers
2. 577 views
prove that(n-1) squared + n + (n+1)squared = 3n +2
1. 1 answer
2. 325 views
prove that2 2 2 2 (n-1) + n + (n+1) = 3n +2
1. 2 answers
2. 326 views
what is mantle dynamics?
1. 1 answer
2. 333 views
what is the efficiency equation?
1. 2 answers
2. 267 views
a 50kg brick bounces with 98% efficiency when droped from a 10 meter ledge.1.how much energy does it have at the top of the
1. 0 answers
2. 402 views
why can't a machine be 100% efficient?
1. 1 answer
2. 376 views
a hairdryer turns 250J of electrical energy into 50J of heated air. how efficient is this machine and how much is wasted to
1. 1 answer
2. 399 views
a kettle turns 1000j electric energy into 350j of heated water. what is its efficiency? where is the other energy 'wasted' to?
1. 1 answer
2. 429 views
ehy can't a machine be 100% efficient?
1. 1 answer
2. 341 views
why is certification and censorship of films and programmes is necessary?- include children are immpressionable and my copy what
1. 0 answers
2. 420 views