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kirza4 [7]
2 years ago
14

Ms. Hartline grades one math test every 1⁄4 hour. How many math tests does she grade in 2 hours? HELP QUICK!!

Mathematics
1 answer:
vazorg [7]2 years ago
4 0

Answer:

8 maths tests

Step-by-step explanation:

Given data

We are told that in 1/4 hour that is 0.25hour (15 mins) She grades 1 math test

our aim is to find how many maths test she grade in 3 hours (120min)

Hence

in  15 mins she does 1 grading

in 120 mins she does x

cross multiply

15x= 120

divide both sides by 15

x= 120/15

x= 8 maths test

Hence in 2 hours, she can grade 8 maths tests

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A. How many ways can you make a code of 3<br> digits if any number can be repeated?
dimulka [17.4K]

1000 ways

First digit of codes: 10 choices (0-9)

Second digit of codes: 10 choices (0-9)

Third digit of codes: 10 choices (0-9)

10*10*10 = 1000

4 0
2 years ago
What are numbers 9 and 10
Novosadov [1.4K]

Answer:

9) not factorable

10) not factorable

Step-by-step explanation:

that's probably why you were having a hard time (-_-)

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3 years ago
WILL GIVE BRAINLY !!! may you help me?​
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Answer:

x - 40

10 - 400

Step-by-step explanation:

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2 years ago
the circumference of a circle is blank. a)the distance around the circle b)the length of a radius c)2pie d)the length of the dia
Misha Larkins [42]

Answer:

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3 years ago
The life spans of a computer manufacturer’s hard drives are normally distributed, with a mean of 3 years 6 months and a standard
german

The probability of a randomly selected hard drive from the company lasting between 2 years 3 months and 3 years 3 months is 32.22%

Given here,

Mean (μ) = 3 years 6 months

= (3×12)+6 = 42 months

Standard deviation (σ) = 9 months

We will find the z-score using the formula: z = (X - μ)/σ

Here X₁ = 2 years 3 months

= (2×12)+3 = 27 months

and X₂ = 3 years 3 months

= (3×12)+3 = 39 months

So, z (X₁ =27) = \frac{27-42}{9} = \frac{-15}{9}= \frac{-5}{3}=-1.666...

and z (X₂ =39) = \frac{39-42}{9}  = \frac{-3}{9}= \frac{-1}{3}= -0.333...

According to the standard normal table,

P(z> -1.666...) = 0.0485 and P(z< -0.333...) = 0.3707

So, P(27 < X < 39)

= 0.3707 - 0.0485

= 0.3222

= 32.22 % [Multiplying by 100 for getting percentage]

So, the probability of a randomly selected hard drive from the company lasting between 2 years 3 months and 3 years 3 months is 32.22%

4 0
3 years ago
Read 2 more answers
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