Answer:
20,12.3,8,6,4,2 3/10 or 2.3
Step-by-step explanation:
Answer
x= 3 and 7
Step-by-step explanation:
√4x-3 - √2x-5=2
√4x-3=2+√2x-5
squaring both sides
(√4x-3)²=(2+√2x-5)²
4x-3=2²+2*2*(√2x-5)+(√2x-5)²
4x-3=4+4(√2x-5)+2x-5
4x-2x-3+5-4=4(√2x-5)
2x-2=4(√2x-5)
again squaring both sides
(2x-2)²=(4(√2x-5))²
(2x)²-2*2x*2+2²=16(2x-5)
4x²-8x+4=32x-80
4x²-8x-32x+4+80=0
4x²-40x+84=0
4(x²-10x+21)=0
x²-10x+21=0
x²-(7+3)x+21=0
x²-7x-3x+21=0
x(x-7)-3(x-7)=0
(x-7)(x-3)=0
now
x-7=0
x=7
x-3=0
x=3
Step-by-step explanation:
Phone card = $20
You need to minus 17.92 from 20 = $2.08
$2.08 / 0.13 = how many minutes
= 16
Answer:
10 inches
Step-by-step explanation:
w = 1/5 P
Multiply each side by 5
5w = 1/5P *5
5w =P
We know the perimeter of a rectangle
P = 2(l+w)
We can set the two equations equal
5w = 2 (l+w)
l =15 inches
We can substitute 15 in for the length
5w = 2(15+w)
Distribute
5w = 30 +2w
Subtract 2w from each side
5w -2w = 30+2w-2w
3w =30
Divide each side by 3
3w/3 = 30/3
w =10
The width is 10 inches