Pls asap

kira solved the equation in the following way.
7/2 − 2x = 11/2
7/2 − 7/2 − 2x = 11/2 − 7/2
−2x ÷ −2 = 4/2 ÷ − 2
x = −1
describe the properties of equality that kira used.

the first step is to use the property of equality to combine the constant terms.
1.addition
2.subtraction
3.multiplication
4.division
the second step is to use the property of equality to isolate the variable.
1.addition
2.subtraction
3.multiplication
4.division

Which function is represented by the graph

If i have a 24 in loaf of bread and i cut it into two pieces one 9 in how long was the other

Afactory makes propeller drive shafts for ships. a quality assurance engineer at the factory needs to estimate the true mean length of the shafts. she randomly selects four drive shafts made at the factory, measures their lengths, and finds their sample mean to be 1000 mm. the lengths are known to follow a normal distribution whose standard deviation is 2 mm. calculate a 95% confidence interval for the true mean length of the shafts. input your answers for the margin of error, lower bound, and upper bound.