數學問題!!!Thank

1a) Write down postive integers m such that m+2n=5,where n is a positive integer

1b) Write down all values of k such that 2x2次+5x+k=(2x+m)(x+n),where m and n
are positive integers.

2) A box contain three card numbered 2,3 and4 respectively while a big contains
two balls numbered 6 and 7 respectively. If one card and one ball are randomly drawn from the box and the bag respectively,find the probability that the sum of the numbers drawns is 10.

3) It is given that 2s+t over s+2t = 3 over 4
(A) Express t in term of a
(B) If s=t=959, find s and t.

4) There are 625 boys in a school and the number of girl is 28% less than that boys
and there have 450 girl in the school.
(A)There are 860 local students in the school.
It is given that 80% of the boys are local students. If x% of the girls are also local students, write down the value of x.

5) Simplify a14次(b3次over a2次)5次

6) Factorize (A) m2次+12mn+362次

7) Mary has 50 badges. The number of badges owned by Tom is 30% less that
that owned by Mary.
(A) How many badges does Tom have?
(B) If mary gives a certain number of her badges to tom,will they have the same number of badges?Explain your answer.

Please Halp!!THANK VERY MUCH