Idon’t understand these !

they are (8,9,and 10

Step-by-step explanation:

8.

39 = 1³/₁₀ b

Convert the fraction to improper form.

39 = ¹³/₁₀ b

Multiply both sides by 10.

390 = 13 b

Divide both sides by 13.

30 = b

9.

½ e = ¼

Multiply both sides by 2.

e = ½

10.

⅖ g = ⅗

Multiply both sides by 5.

2g = 3

Divide both sides by 2.

g = ³/₂

If you want, convert to a mixed number.

g = 1½

the arc length is found by finding the circumference of the full circle (2xpixradius) and then dividing by 4 to find just one quarter of the circle (90 degrees).