It's d because a common goes after Alaska and after state
Answer:
There are 105 male fishes and 195 female fishes
Step-by-step explanation:
Let
x-----> the number of female fishes
y-----> the number of male fishes
we know that
65%=65/100=0.65
so
x=0.65(x+y) ----> equation A
x=2y-15 ----> equation B
substitute equation B in equation A and solve for xy
2y-15=0.65(2y-15+y)
2y-15=1.30y-9.75+0.65y
2y-15=1.95y-9.75
2y-1.95y=-9.75+15
0.05y=5.25
y=105 male fishes
Find the value of x
x=2(105)-15=195 female fishes
Answer:
1 is hard
Step-by-step explanation:
P=2(L+W)
A=LW
given
P=62
62=2(L+W)
divide 2
31=L+W
minus W
L=31-W
sub into other one
A=LW
A=(31-W)(W)
228=31W-W^2
times -1
W^2-31W=-228
add 228 both sides
W^2-31W+228=0
factor
what 2 numbers multiply to get 228 and add to get -31
-19 and -12
(W-19)(W-12)=0
set to zero
W-19=0
W=19
W-12=0
W=12
sub back
L=31-W
L=31-12
L=19
or
L=31-19
L=12
the doorway is 12in by 19in
