You can use the sum and difference identities which for cosine is cos(a+b)= cosacosb-sinasinb
Mixed number is (wholenumber)+(properfraction)
a proper fraction is a/b where a<b and b≠0
so
percent means parts out of 100
x%=x/100
so
276%=
276/100=
200/100+76/100=
2+76/100=
2+38/50=
2+19/25
2 and 19/25
If she picks 2/4 in half an hour she must pick 1.5 in an hour (2/4 x 2) so times that by 2 then its 3
2 hours. She spent 1 hour for math which was half so the total would be 2*1=2.
1/2x=1 /x2
x=2