Top answers

There are 6 orange sweets and n total sweets in a bag. The probability of picking two sweets one at a time randomly and both being orange is 1/3. Show that n^2 - n - 90 = 0

Don't panic, focus on what you do know.You know 6/n * 5/(n-1) = 1/3or 30/(n^2-n) = 1/3simplify this to reach the target expression.
HA
Answered by Hussain A. • Maths tutor
2931 Views

Factorise a^2 - 5a – 14.

Step 1: (a )(a ) Step 2: identify numbers that can multiply to 14: 1 & 14, 7 & 2 Step 3: Identify which pair of numbers add together to make -5: 2 - 7 = -5 Step 4: Check signs: +2 and -7 Step 5: Answ...
JC
Answered by Jasmine C. • Maths tutor
4144 Views

Solve the folllowing quadratic equation: y=x^2+x-6

y=x 2 +x-6 x= (-b+/- sqrt(b 2 -4ac))/2a a=coefficient of x 2 b=coefficient of x c=constant sub values in and find two solutions
EH
Answered by Eashan H. • Maths tutor
4026 Views

3kg of meat costs £54, Nina buys 2 kg of the meat. Work out how much Nina pays. (non-calculator)

I used ratios in this context3kg : £54Using this ratio to work out the price of 2kg 2kg: £? To get from the number '3' to '2', I have to divide 3 by 3, then multiply it by 2So, using this same method (as I w...
PR
Answered by Phazilah R. • Maths tutor
16074 Views

work out 20% of 14000

First work out 10% of 14000.You do this by dividing 14000 by 10 as this will than be a 10th of 14000 and therefore 10%14000 divided by 10 = 1400as the question asks for 20% you will need to add another 10%14...
Answered by • Maths tutor
14523 Views