Find the determinants of the following matrices

a) u= 1 2 answear i got is -13

3 4

w= 6 7 answear i got is -1

7 8

a = 0 3 -1 answear i got is 1

0 2 -1

1 1 1

B = 0 1 2 answear i got is -6

1 0 2

2 2 2

In Mr Jones high school class there are 32 students. There are 20 students who

take mathematics, 15 students who take Physics, and 10 students who take

both. How many students don’t study either of these two subjects. Use the

notation of set theory to describe this situation

In each case compute f g(x) where

f(x) = 2x + 3 and g(x) = x2 − 1.

f(x) = x2 − 1 and g(x) = 2x + 3.

can some 1 help me solve these ?? i did the ones i could please cheack my answear and help me solve the ones i could not do , k thnks cheers !!