Logic and set theory Determine which of the following sentences are propositions and indicate their truth values.

1.Legazpi is the capital of Albay
2.3+4=7
3.x+y=y+x for every pair of real numbers x and y
4.x+1=5 if x=1
5.Answer this question

Which describes increasing the efficiency of energy resource

Asmall electric heater, immersed in 80g of water in a calorimeter of 40j/k raises the temperature from 10.5 degree celsius to 25 degree celsius in 12 minutes. using the same apparatus with 50g of oil instead of water, it is found that the temperature of oil rises from 7 degree celsius to 27 degree celsius in 10 minutes. find specific heat capacity of the oil.

Two point charges are separated by a certain distance. how does the strength of the electric field produced by the first charge