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4 years ago

If b = 7, what is the value of the expression 2(10 – b)?

Mathematics

2 answers:

Jlenok [28]4 years ago

5 0

Answer:

Step-by-step explanation:

Order of operations

PEMDAS

Parenthesis

Exponent

Multiply

Divide

Add

Subtract

$2(10-b)$

$2(10-7)$

First, do parenthesis.

$2(10-7)$

$10-7=3$

$2(3)$

Then, multiply to find the answer.

$2*3=6$

6 is the correct answer.

Stella [2.4K]4 years ago

4 0

Answer:

Step-by-step explanation:

10-7=3

2*3=6

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Zara walked 3/4 mile in 30 minutes. How long will it take her to walk 2 miles?

Talja [164]

Answer:

80 minutes

Step-by-step explanation:

(3/4)/30=2/x

cross product

30*2=(3/4)x

60=3/4x

x=60/(3/4)

x=(60/1)(4/3)

x=240/3

x=80

5 0

4 years ago

A mechanic sells a brand of automobile tire that has a life expectancy that is normally distributed, with a mean life of 27 com

Harrizon [31]

Answer:

Tires that wear out by approximately 24307.8 miles will be replaces free of charge.

Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 27,000 miles

Standard Deviation, σ = 2100 miles

We are given that the distribution of life expectancy is a bell shaped distribution that is a normal distribution.

Formula:

$z_{score} = \displaystyle\frac{x-\mu}{\sigma}$

We have to find the value of x such that the probability is 0.10

$P( X < x) = P( z < \displaystyle\frac{x - 27000}{2100})=0.10$

Calculation the value from standard normal z table, we have,

$\displaystyle\frac{x - 27000}{2100} = -1.282\\\\x = 24307.8$

Tires that wear out by approximately 24307.8 miles will be replaces free of charge.

4 0

4 years ago

What is the sum of (3x - 6) and (5x + 8)?

Andreas93 [3]

Hey there! The sum of (3x - 6) and (5x + 8) is 8x + 2.

5 0

3 years ago

Read 2 more answers

PLEASE HELP!!! Hello, I've really been struggling with trying to figure these out, can someone please help me with these?

kap26 [50]

These are the answers I think may be correct:

- 60 ways
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3 years ago

-10x^2-x+6 + 10x^2-5

e-lub [12.9K]

Answer:

-x+1

Step-by-step explanation:

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4 years ago