María compró 40 reglas para sus alumnos, unas costaron $5 y otras $7 y en total gastó $230 ¿Cuántas reglas de cada tipo compró?

step-by-step explanation:

de-gf

hj=3x+20

ji=15x-64

step-by-step explanation:

because 1/3 is a fraction. we can tell because there is a divisor symbol between the 1 and the 3. if we were to add 2 fractions together, we would add the numerators, which is the number on top, but not the denominators, which is the number on the bottom

1/3+1/3=2/3

hope this !

step-by-step explanation :

we know that

the measurement of the outer angle is the semi-difference of the arcs which comprises

in this problem

m< xzy is the outer angle

substitute the values

the measure of angle xoy is equal to

> by central angle

substitute the value