All categories

2 years ago

If x = 12 and y = 3, what is the value of the following expression?

Mathematics

2 answers:

NeTakaya2 years ago

7 0

The correct answer to the question is 19

Natasha_Volkova [10]2 years ago

6 0

Answer:

A: 19

Step-by-step explanation:

x-8+5y

12-8+(5x3)

12-8+15

4+15

I hope this helps

You might be interested in

A research scientist wants to know how many times per hour a certain strand of bacteria reproduces. He wants to construct the 95

Galina-37 [17]

Answer:

The minimum sample size required for the estimate is 345.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1 - 0.95}{2} = 0.025$

Now, we have to find z in the Ztable as such z has a pvalue of $1 - \alpha$ .

That is z with a pvalue of $1 - 0.025 = 0.975$ , so Z = 1.96.

Now, find the margin of error M as such

$M = z\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

The standard deviation is known to be 1.8.

This means that $\sigma = 1.8$

What is the minimum sample size required for the estimate?

This is n for which M = 0.19. So

$M = z\frac{\sigma}{\sqrt{n}}$

$0.19 = 1.96\frac{1.8}{\sqrt{n}}$

$0.19\sqrt{n} = 1.96*1.8$

$\sqrt{n} = \frac{1.96*1.8}{0.19}$

$(\sqrt{n})^2 = (\frac{1.96*1.8}{0.19})^2$

$n = 344.8$

Rounding up to the next integer:

The minimum sample size required for the estimate is 345.

8 0

3 years ago

A car drives 50 miles east then 40 miles due north how far is it from were he started

Arada [10]

90 miles from where he started

7 0

4 years ago

Read 2 more answers

A motorist takes 80 minutes to travel 120km. find his speed

sergeinik [125]

Answer: 90km/hour

Step-by-step explanation:

The formula for speed is given as:

= Distance / Time

where,

Distance = 120km

Time = 80 minutes = 80/60 = 1 1/3 hours

Speed = Distance / Time

= 120 / 1 1/3

= 120 / 4/3

= 120 × 3/4

= 90km/hour

The speed is 90km/hour.

6 0

3 years ago

Find the Volume. 7 1/5ft 4 1/2ft 3ft

NNADVOKAT [17]

Answer:

97 1/5 cubed ft. or 97.2 cubed ft.

Step-by-step explanation:

7 1/5=7.2

4 1/5=4.5

3=3

7.2x4.5x3=97.2=97 1/2

6 0

2 years ago

Which of the following sets of numbers could represent the three sides of a right triangle?

Sindrei [870]

Answer:

32 60 68

Step-by-step explanation:

These set of numbers are pythagorean triplets

using the formula a2+b2 =c2 with these numbers would give you an accurate relationship in a right angled triangle

4 0

3 years ago