Humans usually have 20 baby teeth, raul said he lost 4/10 of his baby teeth. ana said raul lost 2/5 of his baby teeth. which of these conjectures are true?

Ana and Raul are both correct since 4/10 and 2/5 are equivalent fractions.

Step-by-step explanation:

Fractions are typically written in simpliest form, meaning the numerator and denominator have both been divided by their greatest common factor.  In the case of the baby teeth, we can look at both Raul's fraction and Ana's fraction to see if they represent the same number of teeth overall.  Since there are 20 teeth total, 4/10 of 20 would be 8 teeth since we would multiply both the numerator and denominator by 2.  Also, if we look at Ana's fraction, 2/5 of 20 would also be 8 since we would multiply both the numerator and denomiator by four.  So, both of their conjectures are true.  

439400

step-by-step explanation:

130^2 = 16900

16900*26 = 439400

d. 24+-0.114

step-by-step explanation:

the question requires us to calculate the approximate 95% confidence interval for the mean number of ounces of ketchup per bottle in the sample given the following statistics;

sample mean = 24

standard deviation, σ = 0.4

sample size , n = 49

the confidence interval for a population mean is calculated using the formula;

sample mean ± z-score*(σ/sqrt(n))

the z-score associated with a 95% confidence interval, from the standard normal tables, is;

1.96

substituting these values into the formula;

24 ± 1.96*(0.4/7)

= 24 ± 0.112

from the alternatives given, choice d is closest to the above expression;