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In 2014, Donald's weekly pay was $640. In 2015, Donald's weekly pay was $668,80. Work out the percentage increase in Donald's pay between 2014 and 2015.

To work out the percentage increase, you need to find out the change in his weekly wage between the two years, and divide it by his original pay. You can use the formula (new-old)/old. His new wage is $668.8...
AS
Answered by Aadil S. • Maths tutor
6924 Views

Find the stationary points of y = (x-7)(x-3)^2.

This problem requires the use of the product rule.Let u= x-7 ; by differentiation du/dx = 1. Let v = (x-3)^2 ; by differentiation using the chain rule, dv/dx = 2(x-3) Product Rule: dy/dx = u*(dv/dx) + v*(du/...
SF
Answered by Sam F. • Maths tutor
4160 Views

How many roots does the following equation have? 2x^2 + 4x +2 = 0

(b 2 - 4ac) 1/2 = 0 ---> 1 root
RB
Answered by Rayan B. • Maths tutor
4226 Views

Three whole numbers are each rounded to the nearest 10. The sum of the rounded numbers is 70. Work out the maximum possible sum for the original three numbers.

Three whole numbers are each rounded to the nearest 10. The sum of the rounded numbers is 70. Work out the maximum possible sum for the original three numbers.Sum of rounded numbers is 70, rounded numbers ma...
DC
Answered by Daria C. • Maths tutor
13472 Views

Simplify 2a^3 b × 5a^2 b^3

Law of indices : Rule: a^m * a^n = a^m+nTo multiply expressions with the same base, copy the base and add the indices. Lets start with gathering the a's - a^3 and a^2 adding the indices gets a^5Now b's - b^4...
EP
Answered by Elise P. • Maths tutor
4801 Views