19. Five yards of fabric and three spools of thread cost $40.12. Two yards of the same fabric and ten spools of the same thread cost $23.88. Find the
cost of a yard of fabric and the cost of a spool of thread.
Fabric: ?
Thread: ?

pls ask

by definition, an arc subtended by a central angle of some given measure has the same measure. so .

you didn't give me the choices, so i will just give you the graph so you can look at your choices and choose the right one.

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.