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Find from student what the first step is (get a or b in terms of the other).  

a = 2.8 x10^5 = 0.28x10^6

a + b = (0.28 + 1.6) x 10^6

= 1.88 x10^6

ii)

Know that a^x x b^y...

Firstly, get all of the x's onto one side of the equation and all of the numbers onto the other. To make it easier at the end, subtract the smaller value of x so that it doesn't become negative: 3x-10=12x...

To combine these two fractions into one, you have to multiply the equation by the denominators in order to make a common denominator: 5(x-5)/(x+1)(x-5) + 6(x+1)/(x+1)(x-5) Now that the denominators are th...

A quadratic equations is a second-order equation with at most two solutions.The standard form of a quadratic equation looks like: ax² + bx + c = 0 . For instance if we have the equation x^2...

Answer= 1/4 7+6+11= 24 Green =6/24 Simplifies to 1/4, by division by 6.