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Triss [41]
2 years ago
13

14- (-6) x 45 + 9- 78 + 10=

Mathematics
1 answer:
kap26 [50]2 years ago
8 0
14 - (-270) - 69 + 10 = 14 + 270 - 59 = 284 - 59 = 225;
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Bryson’s dad is 38 years old. If this is four years less than three times Bryson’s age, how old is Bryson?
klemol [59]

Answer:

Bryson’s age is 14 years

Step-by-step explanation:

Let

x ----> Bryson’s age

we know that

Bryson’s age multiplied by 3 minus 4 must be equal to 38

so

The linear equation that represent this situation is

3x-4=38

solve for x

Adds 4 both sides

3x=38+4

3x=42

Divide by 3 both sides

x=14

therefore

Bryson’s age is 14 years

7 0
3 years ago
A sleep time of 15.9 hours per day for a newborn baby is at the 10h percentile of the distribution of sleep times for all newbor
Step2247 [10]

The mean time in hours per day for newborn babies is 16.5 hours ⇒ D

Step-by-step explanation:

A sleep time of 15.9 hours per day for a newborn baby is at the 10th

percentile of the distribution of sleep times for all newborn babies

Assuming the distribution is normal with a standard deviation of

0.5 hour

To find the mean time let us do that

1. Use the normal distribution table to find the corresponding z-score

   for 10th percentile

2. Use the rule μ = x - zσ, where μ is the mean, σ is the standard

    deviation and x is the score

3. Substitute the values of x, σ and z in the rule to find μ

Look to the normal distribution table to find z-score that equivalent

to the area = 10/100 = 0.1 (10th percentile)

∵ z-score = -1.28

∵ σ = 0.5 hour

∵ x = 15.9

∵ μ = x - zσ

- Substitute the values in the rule

∴ μ = 15.9 - (-1.28)(0.5)

∴ μ = 15.9 + 0.64

∴ μ = 16.54 ≅ 16.5 hours

The mean time in hours per day for newborn babies is 16.5 hours

Learn more:

You can learn more about the normal distribution curve in brainly.com/question/8799684

#LearnwithBrainly

6 0
3 years ago
<img src="https://tex.z-dn.net/?f=%20%5Cfrac%7Bp%7D%7B%20-%208%7D%20%20%2B%209%20%3E%2013" id="TexFormula1" title=" \frac{p}{ -
Gnom [1K]

is the answer open circle?

7 0
3 years ago
Read 2 more answers
ABC Office Supply offers an electric typewriter for $129.95. If ABC received a 15% markup on cost by selling the typewriter at t
const2013 [10]
A 15% percent markup means that the typewriter cost was increased by 15%, or 0.15 by moving the decimal 2 places to the left. If the original price was x, and 15% of it is 0.15*x, we can add them up to get 1.15*x=129.95. Dividing both sides by 1.15, we get x=113 dollars
8 0
3 years ago
Read 2 more answers
Write the polynomial in standard form. 2z^4-9z-3z^2
lilavasa [31]

i do not have the answer but i have a website that will help you, its called symbolab and it will change ur life

5 0
3 years ago
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