Math Questions Please Help!!!!!?

Question

1. Arrange in order from smallest to largest.
2.05, 25/10, 2.0513, 2.059, 251/100, 2.0515, 2.052, 2.051

2. Lula wants to round 76.24491 to the nearest hundredth. She first rounds 76.24491to 76.245 and then rounds 76.245 to 76.25 and claims that this is the final answer. What is wrong with this approach?

3. To find the simple interest on a loan for 1 year at 12.5%,
multiply the amount of the loan by 0.125. What simple interest will you pay on a
loan of $1,458 at 12.5% for 1 year?

4. In a bottling company, a machine can fill a 2-liter (L)
bottle in 0.5 second (s) and move the next bottle into place in 0.1 s. How many
2-L bottles can be filled by the machine in 2 h?

5. A circular coffee table has a diameter of 5 ft. What will it cost to have the
top refinished if the company charges $3 per square foot for the refinishing?

Answer 1

OK, let's do this....

1) Arrange from smallest to largest. In order to sort, you must have an equal basis for comparison -- in this case we want to make all the numbers decimals with the same number of decimal places. Since the longest is 2.0515, you need four places after the decimal; in order that is 2.0500; 2.5000; 2.0513; 2.0590; 2.5100; 2.0515; 2.0520; and 2.0510.
So, in order, 2.0500, 2.0513, 2.0515, 2.0520, 2.0590, 2.5000, and 2.5100. You can put them back in original form yourself.

2) Rounding gives an estimate of a number in regards to a relative place value. Rounding each place up to the requested place value can give a false impression of the number's value -- in your example, the number is not closer to 76.25 (Lula's estimate/rounding) than 76.24 (the correct answer).

3) This is a simple calculator problem. $1458 * 0.125 = $182.25.

4) OK, it takes 0.5 sec to fill, plus a 0.1 sec downtime between bottles. Since 2 h = 2 hr * 60 min/hr * 60 sec/min = 7200 sec, we have 7200 sec / (0.5 + 0.1) sec/bottle = (7200 / 0.6) bottles = 12,000 bottles.

5) This is an area question, the area of a circle is (of course), πr². Since the radius of the table is one half the diameter, we have π * (2.5)², or π * 6.25 square feet of tabletop to refinish.
Since each square foot of table is $3, we'll have $18.75 * π, and depending on where you round π, that will be between $58.88 (for pi = 3.14) and 58.90 (for 30 decimal places of pi).

Answer 2

#1 change fractions to decimals....so 25/10 is 2.5 then just put them in order.....ex. 2.05 is smaller than 2.5
#2 what is wrong is she is supposed to look at the thousands place to determine the hundreths place giving 76.24 as the answer.
#3 I=p*r*t plug in the numbers and multiply.

Answer 3

they are easy enough, just try it and see what you get, and that will be your answers, it's simple homework

Answer 4

You should do your own homework