Answer:415
Step-by-step explanation:
Angle DBE + Angle CBE = 90°
(0.1x-22)° + (0.3x-54)° = 90°
(0.4x - 76)° = 90°
(0.4x)° = 166°
x= 1660/4 = 415
(0.1 415 - 22)° + (0.3 415-54)° = 90°
41.5 - 22 + 124.5 - 54 = 90
166 - 76 = 90
Since y varies directly as x, you know that y=245 and x=7 can be used as a proportion, 245/7. When you multiply this proportion to 9, you get 315. This is the value of y when x=9.
y=315
The percentage of boys in the class is 55%. This is because there are 20 people in the class, and 11/20= .55, or 55%
Answer:
y=
Step-by-step explanation:

multiply both sides
8y+5=6
move the constant to the right
8y=6-5
calculate
8y=1
divide both sides
y=
or y=0.125