Z-test should be used when the parent standard deviation is known and the sample size is greater than or equal to 30 (to satisfy the Central Limit Theorem). A T-test should be used when these two rules do not apply.
First you make the fractions top heavy instead of mixed numbers, so:
5/2 × 16/5
Then you just multiply across:
5 × 16 = 80
2 × 5 = 10
Your answer is 80/10, which can be simplified to 8.
The awnser is 1. 2/3
To find the ratio of the length of two different segments , just divide one by another:
BE ÷ DE
4 ÷ 6
4/6
or
2/3
Hope it helps
Answer:
Part A) 
Part B) 
Step-by-step explanation:
we know that
The equation of a exponential growth function is equal to
where
y is the population
t is the number of years since 2010
a is the initial value
r is the rate of change
we have
substitute
Part B) use the equation to predict the population of New York city in 2025
Find the value of t
t=2025-2010=15 years
substitute the value of t in the exponential equation
45 / 9 = 5
55 / 5 = 11
Eric worked 11 hours to prepare 55 kilograms of dough.
