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Differentiate U with respect to x to find dx in terms of du and substitute into the integral so that it is in terms of du, then using e^3x = (e^x)^3 and u = 1+e^x subsitute u in for x and simplify the int...
dx/dt = -5x/2 to solve this we must firstly separate the variables ∫2/x dx = -∫5 dt then we solve the integrals using basic integration formulae 2ln...
Because carbon atoms have 4 electrons in their outer shell so always form 4 covalent bonds in a molecule, so the number of hydrogen atoms bonded can be inferred by subtracting however many bonds the carbo...
"Unseen" reading is much friendlier than it sounds; it's simply a piece of writing which you are given around 15 minutes to read, make notes on, and think about. You're then asked questions base...
Maths is very important in real life. You use it day to day from basic addition and subtraction to working out percentage discounts in shops. Some of the more complex maths like algebra is used in fields ...
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