Answer:
tan65 - tan40 = tan 25 + tan 40 .
using tanA - tan B =sin(A - B)/cosAcosB and tanA + tan B
= sin( A + B)/cosAcosB
= we get :: to prove sin 25/ cos65
= sin65 / cos25 sin 25 = cos (90 - 25)
= cos 65 and sin 65
= cos (90 - 65)
= cos 25
-Leah
Answer:
yes
Step-by-step explanation:
X+y=12
x-2y=6
hmm
multiply 2nd equation by -1 and add to first
-x+2y=-6
<u>x+y=12 +</u>
0x+3y=6
3y=6
y=2
sub back
x+y=12
x+2=12
x=10
x=10, y=2
30/100=3/10
3 divided by 21 = 7
7*10 = 70!
The anwser is $70 I hoped that helped :3