Answer:
3n^2+9+5n^4+55n
Step-by-step explanation:
Steps
$\left(3n^2+9+5n^4-3n\right)+\left(-9n\left(-7\right)-5n\right)$
$\mathrm{Remove\:parentheses}:\quad\left(a\right)=a,\:-\left(-a\right)=a$
$=3n^2+9+5n^4-3n+9n\cdot\:7-5n$
$\mathrm{Add\:similar\:elements:}\:-3n-5n=-8n$
$=3n^2+9+5n^4-8n+9\cdot\:7n$
$\mathrm{Multiply\:the\:numbers:}\:9\cdot\:7=63$
$=3n^2+9+5n^4-8n+63n$
$\mathrm{Add\:similar\:elements:}\:-8n+63n=55n$
$=3n^2+9+5n^4+55n$
Answer:
4,440
Step-by-step explanation:
124% ----------3720
148% ---------- 3720 / 124 x 148 = 4440
Answer: D. Point
A point is a location. On the 2D coordinate plane, it's described by (x,y). Think of it like an address or like latitude/longitude. A point is an undefined term in geometry as it doesn't build off of smaller elements.
The threshold of interest ($13,000) is $6,000 or 3 standard deviations below the mean ($19,000). The rule you are asked to use tells you that 99.7% of the distribution lies within 3 standard deviations of the mean. This tells you that 0.3% lies outside. Since the distribution is symmetrical, half those values are 3 standard deviations above the mean and the half of interest are 3 standard deviations below the mean.
The percentage of buyers who paid less than $13,000 is about 0.3%/2 = 0.15%, according to the rule you are to use.