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tekilochka [14]
3 years ago
5

Traveling at an average rateaverage rate of between 40 and 50 miles per hour for 3 to 4 hours select the best estimate for the d

istance traveled
Mathematics
1 answer:
JulijaS [17]3 years ago
6 0

Answer:

160 miles

Step-by-step explanation:

Distance = speed × time

Speed 1 = 40miles/hr , speed 2 = 50 miles/hr

Time 1 = 3 hrs,  time 2 = 4 hrs

Distance 1 = speed 1 × time 1

= 40× 3 = 120 miles

Distance 2 = speed 2 × time 2

= 50 × 4 = 200 miles

Average distance = (distance 1+distance 2 ) ÷ 2

Distance = (200+120) ÷ 2 = 320 ÷2

= 160 miles

I hope this was helpful, please mark as brainliest

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Complete parts ​(a) through ​(c) below.
Yuki888 [10]

Answer:

a)t_{crit}= 1.34

b) t_{crit}=-2.539

c) t_{crit}=\pm 2.228

Step-by-step explanation:

Part a

The significance level given is \alpha=0.1 and the degrees of freedom are given by:

df = n-1= 15

Since we are conducting a right tailed test we need to find a critical value on the t distirbution who accumulates 0.1 of the area in the right and we got:

t_{crit}= 1.34

Part b

The significance level given is \alpha=0.01 and the degrees of freedom are given by:

df = n-1= 20-1=19

Since we are conducting a left tailed test we need to find a critical value on the t distirbution who accumulates 0.01 of the area in the left and we got:

t_{crit}=-2.539

Part c

The significance level given is \alpha=0.05 and \alpha/2 =0.025 and the degrees of freedom are given by:

df = n-1= 11-1=10

Since we are conducting a two tailed test we need to find a critical value on the t distirbution who accumulates 0.025 of the area on each tail and we got:

t_{crit}=\pm 2.228

4 0
3 years ago
ABCD is a rectangle. AD = 15, AC = 25, and DC = 20. Find BD.
agasfer [191]

Answer:

20

Step-by-step explanation:

it is the same length as DC just going diagonal.

(i am not good at explaining in case you could not tell)

6 0
3 years ago
I NEED HELP ASAP ILL GIVE BRAINLEST TO THE FIRST TO ANSWER THIS CORRECTLY!!!
Hoochie [10]

Answer:

B is correct :D brainliest pls

3 0
3 years ago
What is the factored form of 8x^24-27^6
gladu [14]
The answer is x^6(2X^6-3)(4X^12+6X^6+9)
8 0
3 years ago
Q: Simplify. <br><br>1. 3^(n+1) - 3^n / 3^(n-1)​
igor_vitrenko [27]

Answer:

3^(n+1) - 3^n / 3^(n-1)​ = 6

7 0
3 years ago
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