I’m kinda dumb but isn’t it 0 because anything times 0 is 0
Answer:
Under 99% confidence level we can say that mean speed of the new chips is greater than that of the old chips
Step-by-step explanation:
: Mean speed of the new chip is the same as the old chip
: Mean speed of the new chip is greater than the old chip
to calculate the z-statistic we can use the formula:
z=
if we put the numbers then
z=
=4.8171
The probability of this z-statistic is < 0.001 Therefore Under 99% confidence level we can say that mean speed of the new chips is greater than that of the old chips
The positive trend among the homework scores and the test scores would reveal that if a student does well in homework, he is likely to do well in exams. This can be explained in the sense that the homework will serve as the practice for the student before finally taking the exam.
It is quadratic equation.
First we have find delta given by formula: delta=

where our
a=16
b=-24
c=7
so, delta=

Because delta is positive, there is real results.
Now we can use next formula x=

, to find roots (results, 2 results because its quadratic equation and delta is greater than 0)
x1=

x2=
Answer:
It goes 18 cm every second:
18 x 4 = 72 cm
The bridge is 72 cm long.
Hope this helps!