The answer in the top right. x = 0 or -1/4
1. Obviously 0 is correct, as anything times 0 will always be 0.
2.
36(-.25)^ = 2.25
9(-.25) = 2.25
Answer:
1 
2 
3 
4 
Step-by-step explanation:
From the question
The population mean is 
The standard deviation is 
The sample mean is 
The sample size is 
The mean standard deviation is 
substituting values


Answer:
15 degrees
Step-by-step explanation:
Since ABD is a right angle it equals 90 degrees
ABC is 75 degrees
ABC + CBD = ABD
75 + CDB = 90
Subtract 75 from each side
75-75 + CDB = 90-75
CDB = 15
The other angle is 15 degrees
Answer:
78
Step-by-step explanation:
Given that:
First day (a) = 1
1 more pebble every subsequent day than the previous day
Tn = a + (n - 1)d
d = common difference ; difference between pebbles in two successive days = 1
n = nth day
At the end of the 12th day;
Tn = a + (n - 1)d
T(12) = 1 + (12 - 1) 1
T(12) = 1 + 11
T(12) = 12
Appling the sun if arithmetic progression formula : Sum of AP:
n/2 (a + Tn)
n = number of terms
12/2 (1 + 12)
6(13)
= 78