Answer:
Okay lets start with the easy part's so we know that it is certain to scorer more then 0 and its likely scoring 30 points and same for 50 points or less and its very unlikey to score more then 100 points
I'm pretty sure thats right
Step-by-step explanation:
2 1/4 + 1 5/12 = 3 8/12
3 8/12 - 1 11/12 = 2 -1/4
he used 1 3/4 feet for a craft
Answer:
correct option is A. statistic
Step-by-step explanation:
given data
sample = 30
batteries = AAA
average lifetime = 1500 hours
to find out
find average lifetime with sample battery what is this called
solution
we know that sample mean that is
average of sample is called sample mean and is statistic
so here 30 sample is used
and here statistic is use to calculate the population parameter
so we can say that correct option is A. statistic
Answer:
Vp = 1 / 24 miles/min the speed in still water
Step-by-step explanation:
Lets call Vp speed of swimmer and Vw speed of water then:
Downstream Vp + Vw
Swimmer does 2 miles in 40 minutes then he does
1 mile in 20 minutes
Upstream Vp - Vw
Swimmer does 2 miles in 60 minutes then he does
1 mile in 30 minutes
We get the following system:
(Vp + Vw )* 20 = 1 (1) and
( Vp - Vw )* 30 = 1 (2)
Solving the system
From equation (1)
20*Vp + 20* Vw = 1 ⇒ Vw = ( 1 - 20*Vp ) /20
Plugging that value in the second equation
(Vp - Vw )* 30 = 1 ⇒ [ Vp - ( 1 - 20*Vp )/20 ] * 30 = 1
[20*Vp - 1 + 20*Vp ] * 30/20 = 1 ⇒ [ 40*Vp - 1 ] *30 = 20 or
[ 40*Vp - 1 ] *3 = 2
120* Vp - 3 = 2 ⇒ 120*Vp = 5 and Vw = 1 /120 miles/min
Vp = 5 / 120 miles/min or
Vp = 1 / 24 miles/min
and speed of water Vw = 1 / 120
Angle bisector divides the angle in half so one half equals the other half
(2x+12) = (4x+8)
2x + 4 = 4x
4 = 2x
2 = x
2(2) + 12 = 16
angle QRT is 16 degrees
