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Nookie1986 [14]
2 years ago
15

Exprees in standard form:0.0000042.

Mathematics
1 answer:
soldi70 [24.7K]2 years ago
8 0
The answer is 4.2 x 10^-6
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Damita wants to read a 257-page book in one week,she plans to read 36 pages each day, will she reach jer goal? Explain
Anastasy [175]
Yes, because if you multiply 36 pages with seven days the answer was 252 pages. but ir could be 36 pages and a half
3 0
3 years ago
Last year, the mean running time for a certain type of light bulb was 8.5 hours. This year, the manufacturer has introduced a ch
Free_Kalibri [48]

Answer:

H0 : μ = 8.5

H1 : μ > 8.5

1 sample t test ;

Test statistic = 2.53

Pvalue = 0.994

No, we fail to reject the Null ;

There is no significant evidence to support the Claim that the mean running time of light bulb is greater Tha last year.

Step-by-step explanation:

H0 : μ = 8.5

H1 : μ > 8.5

Test statistic :

(xbar - μ) ÷ (s/sqrt(n))

(8.7 - 8.5) ÷ (0.5 / sqrt40)

Test statistic = 2.53

The Pvalue :

P(Z < 2.53) = 0.9943

Pvalue = 0.994

Decison region :

Reject H0 ; if Pvalue < α

0.9943 > 0.05 ; We fail to reject the Null

5 0
3 years ago
Landon is driving at a constant speed of 55 miles per hour. At hat rate, how long will it take him to drive 275 miles?
Elza [17]

Answer:

5hours

Step-by-step explanation:

At constant speed, distance speed= distance/time taken

therefore, time will be obtained by the division of distance traveled by the speed.  

in this question the distance is provided but time is not hence time is calculated as follows. time= distance/time taken

                            =275miles/55miles/hour

                            = 5hours

5 0
2 years ago
Read 2 more answers
20 square root of 270 /4 square root of 3
OleMash [197]

Answer:

<u>The most simplified form is 15√10</u>

Step-by-step explanation:

1. Let's simplify the expression:

20√270 ÷ 4√3

20√9 * 30/  4√3 (√270 = √9 * 30)

60 √30/ 4√3

(60 √3 * √10) / 4√3 (√30 = √3 * √10)

60/4 √10 ( We cancel √3 in the numerator and in the denominator)

15√10

<u>The most simplified form is 15√10</u>

6 0
3 years ago
Carrie wanted to make pudding for dessert for her family. However, she couldn't find a recipe that would make 4 servings. She de
Naddika [18.5K]
All you have to do is make 1 into a fraction 4/4+1/4 makes the 8 servings
find and equivilent fraction so 8/8+2/8= 8 servings half it 4/8+1/8= 4 servings so half a cup and an eighth of a cup or 5/8 of a cup hope this helped you have a great day!!
5 0
3 years ago
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