In a school, 220 students offer Biology or Mathematics or both. 125 offer biology and 110 Mathematics. How many offer Biology but not Mathematics? ​

your answer is a

step-by-step explanation:

4*4*4*4=256

do you mean add both of the equations together

because if you do the answer is 10x-5

step-by-step explanation:

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.