Answer:
Clare's score was 70.
Step-by-step explanation:
N = 20
M = 30
C = ?
Mean = (Sum of all values)/3
40 = (20 + 30 + c)/3
40 = (50 + c)/3
50 + c = 120
c = 70
Answer:
It takes at least 7 months for the cat to be at least 6 kg lighter than the original weight.
Step-by-step explanation:
Use exponential decay formula:
A = P (1-r)t
A = amount decreased to
P = original amount
r = rate of decrease
t = time
6 ≥ 12 (1-0.10)t divide both sides by 12
0.5 ≥ (0.9)t take log of both sides
log (0.5) ≥ log (0.9)t power rule of logs lets the exponent t drop to front of log to become a factor
log (0.5) ≥ t log(0.9) divide both sides by log(0.9) which is negative so reverse the inequality sign
log (0.5) / log (0.9) ≤ t use calculator
6.57 ≤ t
It takes at least 7 months for the cat to be at least 6 kg lighter that original weight.
check:
12 (0.9)7≈ 5.73
12 (0.9)6 ≈ 6.37
Answer:
Common ratio r = 0.5
Step-by-step explanation:
Given the geometric series 0.27 + ...
This is infinite geometric series with 
unknown common rate r and sum S of 54% that is 0.54 as decimal.
Use formula
Hence,
Answer:
The total surface area of cone is 70π cm² or 219.9 cm².
Step-by-step explanation:
Given that the formula of total surface area of cone is T.S.A = πr² + πrl where r represents radius and l is slant height. So you have to substitute the values :
Answer:
507 m^3
Step-by-step explanation:
multiply all sides by eachother
13x13x3= 507
