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sashaice [31]
3 years ago
14

Cual es el resultado de la siguiente expresión aritmética?(-3) (1/8)+(-2.5)

Mathematics
1 answer:
nydimaria [60]3 years ago
4 0

Answer: =-2.875

Step-by-step explanation:

\left(-3\right)\left(\frac{1}{8}\right)+\left(-2.5\right)

=-3\cdot \frac{1}{8}-2.5

=-\frac{3}{8}-2.5

=-0.375-2.5

=-2.875

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Two companies manufacture a rubber material intended for use in an automotive application. The part will be subjected to abrasiv
user100 [1]

Step-by-step explanation:

Due to the time it took to solve this question, I had little time to type the answers fully

The answers are contained fully in the attachment I have uploaded.

A. H0: u1 = u2

H1: u1 not equal to u2

The t statistics was solved to be 3.03

The degree of freedom was solved to be 26

Given this information, this is a 3 tailed test, critical value at 5% = +-2.056

T stat > critical value

We therefore reject the null hypothesis at 5% and conclude they have different mean wear

The p value is calculated using excel and the result is 0.00544

We reject null at 5% since p value is less than 0.05

B. H0: u1 = u2

H1: u1>u2

Alpha = 0.05

Following a,

Test stat = 3.03

Df = 26

Critical value for 1 tailed test = 1.706

Test stat > 1.706

We reject H0 and conclude company 1 has higher mean wear.

We find p value for a right tailed distribution using excel

Tdist(3.03,26,1)

= 0.002722

We reject h0

C. Confidence interval

1.610 < u < 8.390

8 0
3 years ago
How do u do this question:(
aksik [14]
C=3.14r^2 that's the formula a
5 0
3 years ago
Read 2 more answers
the electricity goes out in a house. the temperature in the house changes by -8 fahrenheit in 4 hours. on average, by how many d
Aliun [14]

Answer:

-2 degrees per hour

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
There are 1420 students enrolled at Senn. If 60% of these students walk to school, how many students are walking to school?
pychu [463]

Answer:

852 students walking to school

Step-by-step explanation:

Lets start with a simple example so you can get it

if 60% of 100 students walk to school that means

60 students walk to school... right??

so lets simplify it more that means you have multiplied 100 (students) by 60%

or \frac{60}{100}  (note: you can say that 60% is equal to \frac{60}{100} )

so the problem told 60% of 1420 students walk to school that means we should

do this:     1420*\frac{60}{100} = 852

3 0
3 years ago
Read 2 more answers
A worker is handling the four of a rectangle room that is 12 feet by 15 feet.The tiles are square with side lengths 1 1/3 feet.
Anon25 [30]

Answer:

Step-by-step explanation:

The measure of the floor of the rectangular room that is 12 feet by 15 feet. The formula for determining the area of a rectangle is expressed as

Area = length × width

Area of the rectangular room would be

12 × 15 = 180 feet²

The tiles are square with side lengths 1 1/3 feet. Converting 1 1/3 feet to improper fraction, it becomes 4/3 feet

Area if each tile is

4/3 × 4/3 = 16/9 ft²

The number of tiles needed to cover the entire floor is

180/(16/9) = 180 × 9/16

= 101.25

102 tiles would be needed because the tiles must be whole numbers.

3 0
3 years ago
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