Recent content by blunted

Homework Statement A sequence of 3-digit numbers divisible by 7 is given. Find: a) first three and last three numbers. b) how many numbers are there in that sequence. c) sum of all the numbers in the sequence. Homework Equations The Attempt at a Solution Cause they are 3...

Oh, right.. Thanks!

How did you get to that equation? :O

Homework Statement If the roots of x^2 - 2x + 4 = 0 are x1 and x2, what is x1^2 + x2^2? Homework Equations The Attempt at a Solution I don't think these questions can be answered by solving for x only cause there will be no real root(complex number). So I found that x1 + x2 =...

Seems like too much maths is not good. I head off to bed. Thanks for the help.

I cannot wrap my head around it. No matter how much I tried.

But I found the mother's age today. 5 years after.

Mother's age: 30. The sum of her sons ages: 15

I did all that, of course. But I still have an inkling that I'm doing something wrong.

Homework Statement The age of a mother is twice the sum of ages of her 2 sons. 5 years later the mother will be 20 years older than the sum of ages of her sons. What age is the mother today? Homework Equations The Attempt at a Solution M - mother ; S1 = son1 ; S2 = son2. S = S1...

Homework Statement If n(A - B) = 5, n(A' - B) = 4, n(A') = 10, n(B'-A') = 12. What is n(AUB) = ? Homework Equations The Attempt at a Solution I drew a big rectangle and inside 2 intersected diagrams A and B. I drew 5 dots in the (( of diagram A. Now that A' is complementary that...

Okay found it, thanks.

Can't make a move..

Homework Statement Out of 36 passengers in a bus. 8 have caps, 2 have both cap and eye glasses , 26 don't have eye glasses, how many passengers have neither caps nor eye glasses Homework Equations The Attempt at a Solution A draw 2 intersected diagrams C and E. In C I write 6...

Thanks.