Answer:
john's age= x + 5
his sister's age= x
x + 5 + x = 150
2x + 5 = 150
2x = 150 - 5
2x = 145
x = 145 ÷ 2
x = 72.5
so, 72.5 + 5 = 77.5
john's present age is = 77.5
his sister's present age is = 72.5
Step-by-step explanation:
t/-3,2 < 5
t > 5 × -3,2
t >-16
Answer:
8/9
Step-by-step explanation:
add two fractions, such as 2/9 + 2/3, make sure that the two denominators are the same and then we simply add the numerators.In cases where the denominators are not the same, you would find the lowest common denominator and adjust the fractions to keep them intact.
PiR^2 is the area so R^2 = 4*4 = 16
16 * Pi = 50.265 the rug will take up 50.265 ft
Answer:
The study provided uses a Cluster sampling method.
Step-by-step explanation:
The researcher first selects all the schools in the district.
Then he samples 5 schools from the entire district using a random number generator.
Then the researcher interviews every teacher from the 5 schools selected.
This is an example of cluster sampling.
In a Cluster sampling method, the researchers first divide the entire population into homogeneous groups, then selects a random sample of groups form the population. Then they select a random sample from each group selected.
If the researcher samples the entire groups selected then this is the case of one-stage cluster sampling and if they select a random sample of fixed size from each group selected then this a case of two-stage sampling.
Thus, the study provided uses a Cluster sampling method.