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Breathe in, you can feel your chest expanding and your body lifting up. When you breathe in, oxygen in the air around us moves into our lungs. The air moves through tubes called bronchi which branch, like...

The key to this is to not expand everything out and try work it out through that process. The easiest way is to notice that (x^2+5x+6) = (x+2), (2x^2+10x+12)=2(x+3)(x+2) and (x^2+x-2)= (x+2)(x-1).From thi...

Ka = 10^-pKa = 10^--3 = 1000[H⁺] = √ Ka [0.025] = √1000 x 0.025 = 0.791pH = -log [H] = -log(0.791) = 0.102 = 0.1

The perfect tense is a compound tense. This is because a sentence in the perfect tense is constructed from an auxiliary verb and a past participle.Let's use the simple sentence "I have played" a...

2 * 2 * 2 * 5 * 7 = 280