Answer: Hence Pair( x, y) = [ 105/2, 105/2]
Step-by-step explanation:
Given that;
Among all pairs of numbers with a sum of 105;
the pair whose product is maximum = ?
so let pairs of numbers with a sum of 105 be x and y respectively
x + y = 105
let y = 105 - x
now
product = xy = x( 105 - x ) = 105x - x²
now
p(x) = 105x - x²
for maximum value of p
dp/dx =0
⇒ dp/dx = 105 - 2x = 0
2x = 105
x = 105/2
y + x = 105
y = 105 - x
y = 105 - 105/2 = 105/2
Hence Pair( x, y) = [ 105/2, 105/2]
Answer:
a= 74
c= 10
d= 25
e= 10
f=16
g= 90
h= 24
j= 26
k= 154
m= 70
n= 170
p= 156
r= 154
s= 129
t= 148
v= 55
w= 41
x= 55
y= 24
z= 106
Step-by-step explanation:
1. addition
2. subtraction
The answer is to this question is c
The total money Elaine spent is $15.7
$20-$15.7= $4.3 left
