First one maybe I’m not too sure
Answer:
The mean of the combined group of 30 students is equal to 56.67
Step-by-step explanation:
Let
x ----> The sum of the notes of the 20 papers
y ----> The sum of the notes of the 10 papers
we know that
60=x/20 -----> x=60*20=1,200
50=y/10 -----> y=50*10=500
The mean of the combined group of 30 students is equal to
(x+y)/30
substitute
(1,200+500)/30=56.67
→ Here,
- y varies directly as x means that y = kx
- here value of (k) is not known
by substituting the values of x and y, y = 18 when x = 12
Now, substituting value of k nd x in y = kx
Answer:
12/40
top is number of times it landed and bottom is total trys
Given equation:
P=1500 (1.04)^x
When have to find x, when population, p=1900
Put value of P=1900 in above equation.
1900=1500(1.04)^x
Divide both sides by 1500
19/15=(1.04)^x
1.27=(1.04)^x
Take natural log.
ln(1.27)= ln(1.04)^x
ln(1.27)=x ln (1.04)
Divide both sides by ln (1.04)
x=6 years
Answer: 6 years