Answer:
The estimate of the proportion of all students that prefer to use a metal pen is 0.4.
Step-by-step explanation:
The estimate of the proportion is the sample proportion.
In the sample:
10 students
4 use a metal pen. So
The estimate of the proportion of all students that prefer to use a metal pen is 0.4.
Step-by-step explanation:
Use a proportion for this problem.
1. Put 614% over 100.
2. Put a fraction bar = fraction bar.
3. On the second fraction, put 3,875 on the denominator
4. Multiply in a diagonal, divide the number that is Not in a diagonal.
And you have your answer.
Your answer is 23,792.50.
9514 1404 393
Answer:
7.7 seconds
Step-by-step explanation:
The solution is given by the quadratic formula.
For ax² +bx +c = 0, the roots are ...
x = (-b±√(b²-4ac))/(2a)
We want the positive root, so ...
x = (-113 -√(113² -4(-16)(74)))/(2(-16)) = (113 +√17505)/32 ≈ 7.6658
The rocket will hit the ground about 7.7 seconds after it is launched.
