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What is the probability that you pick a blue ball from a bag of 3 blue balls, 4 red balls and 2 black balls

total number of balls = 3+4+2=9number of blue balls = 3probability of picking a blue ball = total number of blue balls/total number of ballstherefore = 3/9=1/3
OA
Answered by OLA A. • Maths tutor
5059 Views

Solve the simultaneous equations 5x + 2y = 4 and x - y - 5 =0

First label the equations. 1: 5x + 2y = 4 . 2: x - y - 5 = 0 . Rearrange equation 2 . 2: y = x - 5 Substitute equation 2 into equation 1 . 5x + 2( x - 5 ) = 4 . 7x = 14 . x = 2 . Substitute x = 2 into equati...
CS
Answered by Conor S. • Maths tutor
6091 Views

How do you expand and simplify (x − 6)(x + 2y)^2

start of by expanding the braquet which has got a power(x + 2y) (x + 2y) = X 2 + 2xy + 2xy + 4Y 2 then simplify that => x 2 + 4xy + 4y 2 then multiply that by (x - 6) (x - 6) (x 2 + 4xy + 4y 2 ) = x 3 + 4...
AO
Answered by Antoine O. • Maths tutor
5714 Views

How would you solve 4x > 7 - 10x ?

When solving an inequality, you want to get all of the x terms on one side, just like when you're solving an equation. Therefore, adding 10x to each side would give us:4x (+10x) > 7 - 10x (+10x) which giv...
SG
Answered by Sarah G. • Maths tutor
3693 Views

Ed has 4 cards. There is a number on each card. Three of the numbers are 12, 6 and 15. The mean of the numbers is 10. What is the fourth number?

To find the mean you add all the numbers together and divide by the number of numbers. Call the fourth number x. Then we know that (12+6+15+x)/4 =10. then multiply both sides by 4 to get 12+6+15+x=40 which i...
SP
Answered by Sarah P. • Maths tutor
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