What is the format of this proof?

Given: ∠ABC is a right angle, ∠DBC is a straight angle
Prove: ∠ABD is a right angle

A horizontal line has points D, B, C. A line extends vertically from point B to point A. Angle A B C is a right angle

true !

step-by-step explanation:

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;

(0.2)+(-8)=0.3+-3+0.3m is the equation i guess? ?

step-by-step explanation: