Answer:
- equation: w +(2w -3) = 18/2
- length = 5 cm
- width = 4 cm
Step-by-step explanation:
Let w represent the width in cm. Then the length is 2w-3, 3 cm less than twice the width. The perimeter is twice the sum of these, so the sum of length and width is half the perimeter:
w + (2w -3) = 18/2
3w -3 = 9 . . . . collect terms
3w = 12 . . . . add 3
w = 4 . . . . divide by 3
2w-3 = 2·4 -3 = 5 . . . . length
The equation is w + (2w -3) = 18/2; the length is 5; the width is 4.
The annual interest owed is
... 7% × $115,000 ≈ $8050
The monthly interest owed is 1/12 that amount.
... (1/12) × $8050 ≈ $671
_____
Some calculators are able to use 7% as a factor; others require you use the decimal equivalent, 0.07.
Answer:
m<DBC=120°
Step-by-step explanation:
2x+x+90=180
3x=180-90
3x=90
x=30
m<DBC=x+90=30+90=120
Answer:
d = 7
Step-by-step explanation:
(1,-8), (1,-1)
Sqrt[(1-1)^2+(-8 - - 1)^2]
Sqrt[(0)+(-8+1)^2]
Sqrt(-7)^2 = 7
d = 7
