Answer:
DP = 16
Step-by-step explanation:
PK = KA = 12
using the Pythagorean theorem:
DP² = 20² - 12²
DP² = 400 - 144 = 256
DP = 16
Answer:
An equation contains an equal sign; an expression does not.
Both expressions and equations contain numbers and/or variables
Step-by-step explanation:
oldest: 48 pages / 60 mins = 0.8 pages / min
middle: 18 pages / 14.4 mins = 1.25 pages / min
youngest = 5 pages / 4 mins = 1.25 pages / min
The middle brother and the youngest brother are reading at the same constant of proportionality.
let x = minutes spent reading.
let y = total pages read.
y = 1.25x
If the original price is x, then x-0.10x=0.9x (which is a 10 percent off discount - 10 percent = 0.10 if you move the decimal spot 2 places over), then 10% of 0.9x is not 0.10x due to that 0.1/0.9=1/9, not 1/10. 1/10 of 0.9 is 0.09, so
0.9-0.09=0.81 of the original price
If the 10% sales tax was added first, it wouldn't matter since you're still getting 10% twice either way