A. 314 sq cm
Explanation: pi•r^2
3.14 x 10^2
3.14 x 100 =314
Answer:
mean = 11.2 = 11
Step-by-step explanation:
mean = average = (10+11+10+12+10+11+13+13+11+11)/10 = 11.2=11
Answer:
Solution
x = 90
Step-by-step explanation:
Combine multiplied terms into a single fraction
4
9
+
1
5
⋅
=
5
8
\frac{4}{9}x+\frac{1}{5} \cdot x=58
94x+51⋅x=58
4
9
+
1
5
⋅
=
5
8
\frac{4x}{9}+\frac{1}{5} \cdot x=58
94x+51⋅x=58
2
Combine multiplied terms into a single fraction
3
Multiply by 1
Answer:
<h2>a) Average velocity = 278 units</h2><h2>b)
Instantaneous velocity at t = 7 seconds is 148 units</h2>
Step-by-step explanation:
a) Average velocity is the ratio of displacement to time.
We have
s(t) = t³ + t
t is in between 7 and 12
s(7) = 7³ + 7 = 350
s(12) = 12³ + 12 = 1740
Displacement = 1740 - 350 = 1390
Time = 12 - 7 = 5
Displacement = Average velocity x time
1390 = Average velocity x 5
Average velocity = 278 units
b) s(t) = t³ + t
Differentiating
v(t) = 3t² + 1
At t = 7
v(t) = 3 x 7² + 1 = 148 units
Instantaneous velocity at t = 7 seconds is 148 units
