Top answers

If a = 2.8x10^5 and b=1.6 x 10^6, give the values of i) a +b and ii) a x b

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 = ab^x+y .: 2.8 x 1.6 = 4.48 10^5 x 10^...
JA
Answered by Jerry A. • Maths tutor
2371 Views

Solve this equation: 3x-10=12x-7

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-7 ...
EL
Answered by Emma L. • Maths tutor
3376 Views

Simplify (5/x+1) + (6/x-5)

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 the s...
EL
Answered by Emma L. • Maths tutor
3401 Views

How to solve a quadratic equation by using the discriminant or by factoring?

A quadratic equations is a second-order equation with at most two solutions.The standard form of a quadratic equation looks like: ax 2 + bx + c = 0 . For instance if we have the equation x 2 - 2x - 35 = 0(wh...
KH
Answered by Kader H. • Maths tutor
2750 Views

If Tom has a bag of balls with 7 orange, 6 green and 11 blue, what is the probability that he will pick a green ball?

Answer= 1/4 7+6+11= 24 Green =6/24 Simplifies to 1/4, by division by 6.
SS
Answered by Sam S. • Maths tutor
1963 Views