HELP

Simplify: ? (10x = 105 - (12x – 247)

Greeley [361]

Answer:

x = 16

Step-by-step explanation:

10x = 105 - (12x - 247) //Distribute - sign

10x = 105 - 12x + 247 // Add 12x & combine like terms

10x + 12x = 352

22x = 352 //Divide 22

x = 352/22

x = 16

7 0

3 years ago

If magazines cost $0.50 each, how much will 3 magazines cost?

denis23 [38]

What you want to do is do:

0.5 + 0.5 + 0.5 to find how much 3 magazines are.

So, three magazines cost $1.50

6 0

4 years ago

Read 2 more answers

The amount of time people spend exercising in a given week follows a normal distribution with a mean of 3.8 hours per week and a

Travka [436]

Answer:

i and iii) In the figure attached part a we have the illustration for the area required for the probability of less than 2 hours and in b the illustration for the probability that X would be between 2 and 4

ii) $P(X$

And using the normal standard table or excel we got:

$P(z$

iv) $P(2$

And we can find the probability with the following difference and usint the normal standard distirbution or excel and we got:

$P(-2.25$

Step-by-step explanation:

Let X the random variable that represent amount of time people spend exercising in a given week, and for this case we know the distribution for X is given by:

$X \sim N(3.8,0.8)$

Where $\mu=3.8$ and $\sigma=0.8$

Part i and iii

In the figure attached part a we have the illustration for the area required for the probability of less than 2 hours and in b the illustration for the probability that X would be between 2 and 4

Part ii

We are interested on this probability:

$P(X$

We can use the z score formula given by:

$z=\frac{x-\mu}{\sigma}$

Using this formula we have:

$P(X$

And using the normal standard table or excel we got:

$P(z$

Part iv

We want this probability:

$P(2$

Using the z score formula we got:

$P(2$

And we can find the probability with the following difference and usint the normal standard distirbution or excel and we got:

$P(-2.25$

3 0

4 years ago

Paul is comparing the cost of cell phone services. At CellCoA, the phone he wants costs $305 and the unlimited calling plan cost

Darya [45]

In 3 months the cost will be the same, they will both cost $440, A is expressed as Cost = 305 + 45m (months) while B is expressed as Cost = 350 +30m because their cost will be the same equation A will equal equation B, 305 +45m = 350 +30m, subtract 30m from both sides to get 305+15m = 350, then subtract 305 from both sides to get 15m = 45, divide by 15 to get m to get m=3 which equals to x=3 input x in both equations to get your y, y = 45(3) + 305 and y= 30(3) + 350, they both give you the answer y= 440 so the point they intersect at is (3,440)

6 0

4 years ago

Read 2 more answers

Timothy has computer class 3 times a week. Each class is 45 minutes long. How many hours of computer class does Timothy have per

bulgar [2K]

18 classes
i might be wrong

6 0

3 years ago