Answer:
Step-by-step explanation:
Scale= length on drawing / actual length
Let the actual length b x
3:10=2/5/x
3/10=2/5x
Cross multiply
15x=20
x=4/3
The actual length is 4/3
Sum of interior angles of a polygon = (n-2)180 [where n = no. of sides]
(n-2)180 = 720
n-2 = 720/180 = 4
n-2 = 4
n = 4+2 = 6
So it is a 6 sided shape (Hexagon)
Answer:
Step-by-step explanation:
Given that for a sample of size n = 13, mean =122 and std dev = 13
STd error of sample =
Hypotheses:
(One tailed test at 5% sign level)
Mean difference = 1 and test statistic
df = n-1 =12
pvalue = 0.3929
Since p > alpha, accept null hypothesis
There is no evidence to prove that mean is greater than 121.
Answer:
55x^4+25x^3+35x^2
Step-by-step explanation:
5x²(4x^2+8x-1 and 7x^2-3x+8)
Applying distribution property,we have
- 5x^2(4x^2+8x-1 + 7x^2-3x+8)
- (5x^2)*(4x^2)+(5x^2)*(8x)+(5x^2)*(-1)+(5x^2)(7x^2)+(5x^2)*(-3x)+(5x^2)*(8)
Simplifying them,we have
- 20x^4+40x^3−5x^2+35x4−15x^3+40x^2
- 55x^4+25x^3+35x^2