Answer:
eight point nine seven, 8+0.9+0.07
Step-by-step explanation:
5000-850=
$4150 left to raise
$4150/83 students=
$50/student
Making the assumption that your problem looks like this,

we use the distributive property to multiply:
width= 7m
Step-by-step explanation:
Area= L×W
L= (x+8)m
W=8m
105m²= (x+8)m × (x)m
105m²= x² + 8x
-x² - 8x + 105= 0
(x-7) (x+15) = 0
x= 7 x= -15
x=width = 7m
77/5=99/x
77x=5*99
77x=495
x=495/77
x=6.4
she needs to study 6.4 hrs to get 99