Help with math homework? please!? must b really easy but i dont get it.?

Question

1. 35% of 50 is what?
2. Emma got 82% on a 40 question test. About ho w many questions did she answer correctly?
3. Amir's favorite ice cream used to cost $1.50 until the price was raised to $1.75. what perfect increase was that?
4. Jenny paid $12000 for her car. Five years later she sold it for $8500. What percent decrease is this?
5. The Music Box marked up their cd's 75%. If the Music Box charges $20 for a special cd, how much did it cost before the markup? (the answer is not $15)
6. Quinn deposits $2000 in a savings account that pays 4% compounded semi-annualy. How much money will Quinn have in her account after two years?


i know they must be really easy... i just dont like percentages.

Answer 1

1. 50 x (.35)=17.5
Explanation %=((part of)/whole )x100
so part of=whole (%/100)
2. 40 (.82)=32.8 (33)
Same as above

3. (1.75 -1.5)/1.5=.166 16.6%
Explanation again %=((part of)/whole )x100
In this case the original whole is 1.5

4. (12000-8500)/12000=.291 0r 29.1%
In this case the original whole is 12000

5. 20/1.75=11.43
Here is a bit tricky x(1+%/100)=the new whole (interesting term ha?) or the original whole + increase = the new whole :)

6.2000(1+.04) (1+.04)=2163.2 (made a mistake earlier)


year 1 principal + % or earned interest (1)
year 2 principal + % or earned interest (1) +(principal + % or earned interest (1) %)

Answer 2

Percent is a fraction of 100. It can be written with a decimal as .xx because the second place beyond the decimal is the hundredths place.

So 44% = .44 or 32% = .32

Now all you gotta do is some multiplication to figure out most of this. For #1 you would solve the equation as 50 * .35 = Answer.

To find a percent you must solve an equation like this for #2:
1.50 * Answer = 1.75
Divide both sides by 1.50 and you will have an answer that will be some kind of number with a 1.xx. If the answer is 1.84 then that would be 84%. The 1 represents the 100% of the original item and the .xx represents the increased percent.

Hope that helps.

Answer 3

it is algebra... on your first question: enable's positioned them into extra comprehensible words, instead of the well-known x and y. enable's say the quantity of oil you have is o(for oil). in case you employ v litres (v for quantity), then it is going to final you d days. So the equation right it extremely is o = dv. subsequently, o = 12 L. Now, if we use this oil at a fee of 0.3L/hr, then the equation turns into 12L = d * 0.3L. the respond is then 40 hours, or a million 2/3 days. Now, your 2d question... as quickly as returned, do away with the well-known variables. in case you stroll s km/h to a trip spot d km away, it is going to take t hours. it extremely is the fee-distance-time ratio, d = st. on account that d is already given to us, we are able to alter it to 20 = st. One facet of a precise sq. is L cm. the component of the sq., a, is comparable to the component of a parallelogram. the backside of the parallelogram is b, the top h. on account that L is already given to us (4), a subsequently equals sixteen cm². Now, by way of fact the parallelogram has an identical section, the equation is sixteen = bh. in any different case it could be L²=a=bh.

Answer 4

1) 17.5
2) 32.8, probably 33 since you can't get .8 of a problem right
3) 16.7% increase
4) 29.2% decrease
5) $11.43
6) 2339.72

can u do my hw too?

Answer 5

1) 17.5
2) 33
3) 17%
...... i am tired! :))