HELPMEEEEEEEEEEEEE

I got this image fromo online, I hope this can clarify some of your confusion.

If the average cost of the plane ticket for 5 days was $67, that means the sum of the costs is 5*67= $335. The first four days are given at $40, $44, $50, and $60. The sum of those is $194. The cost of the ticket on the last day would be $335-$194= $141.

Hope it helps!

If two dice are rolled, there are 6*6=36 number of possibe outcomes. If a number is less than 4 on a dice, that means it can be 1,2, or 3 giving you 3 choices. That makes 3*3=9 number of possible outcomes of both numbers being less than 3. For the probability, it would be 9/36=1/4.

Hope it helps!

Neither of those explanations are correct...

The first one states that you multiply 19.5% by 15 to find the total amount of decay. But in the problem you need to raise 19.5% to the 15th power instead of multiply it by 15...

For the second one, decay doesn't work at a common rate...decay is taking off a chunk of the remainder of what's left not of the original total.

Hope this helps!

The first case that you can remeber is if the next three digits are the same. There are 7*10*10= 700 ways to have the first three digits. Since you repeat the next three number again, that means that there is only 1 more digit that can be different from the rest which has 10 different options. There are 7000 ways for the first case and the second case is the same making your answer 7000*2=14000 seven-digit phone numbers.

*Correct me if something is wrong

Hope it helps!

If it decays 19.5% per minute, that means that 100%-19.5%= 80.5% of the element remains after each minute. If it decays for 15 minutes, that means the mass would be calculated by 590*80.5^15= 22.8 grams to the nearest 10th.

Hope it helps!

Last question of the day for me, the perimeter of the rectangle is 8x+44 which equals 76, that makes x= 4 feet. The length equals 3*4+10= 22 and the width equals 4+12= 16. The area is 16*22= 352.

Hope it helps!

I giveth thy welcometh. 

And sorry, I won't be able to answer any more of your questions today, I'm wrapping up for today.

Based on the information given, there are 24 parallelograms on top and 24 on bottom, that makes 48 sides with a length of 20 feet. There are also four sides with a length of 62 feet. So your answer is 48*20+4*62= 1208 feet.

Hope it helps!