If liam arranges chairs in 9 rows of the same length he has 3 chairs left over if he arranges the chairs in 7 rows of that same length he has 19 left how many chairs does he have

75 chairs

Step-by-step explanation:

let x=number of chairs per row

let y=total number of chairs

use linear function:

y=9x+3

y=7x+19

9x+3=7x+19

9x-7x=19-3

2x=16

x=8

plug 8 into either equation

9×8+3=75

7×8+19=75

126.66 m²

step-by-step explanation:

the pertinent area formula is a = πr², where r is the radius.

here, a = π(6.35 m)² = 40.32π, or approximately 126.66 m²

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.