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3 years ago

Someone please help me I'm confused

Mathematics

2 answers:

Vesnalui [34]3 years ago

8 0

Answer:

Step-by-step:

Ok. First, for volume, you do V= L x W x H.

What that means is, you would do 25cm x 20cm x 4cm. That would give you the answer.

Now for surface area, I don’t know the formula, I do it in my head. The answer for Surface Area is 1,360 cm.

I hope I helped you!

Alex777 [14]3 years ago

6 0

Answer:

Volume: 2000 cm^3 Surface Area: 1360cm^2

Step-by-step explanation:

Ok, so we know the formula for volume is length x width x height, so we can substitute in the numbers given, so we end up with:

25 x 4 x 20

when we multiply them together, we get:

2000cm^3. That's the volume.

The formula for Surface Area is:

S.A.=2(lw+wh+lh) . Now we substitute in the numbers given

S.A.=2( (25 x 4)+(4 x 20)+(25 x 20)) . Then we add and multiply, so we get:

S.A. = 1360cm^2

The Surface Area is 1360cm^2.

Hope this helped, sorry if I was wrong somewhere!

~Mschmindy

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3 years ago

Read 2 more answers

L = $20 r = 4% t = 2 years

Annette [7]

I'm guessing this is a question about interest rates? If you have $20 that increases by 4% in one year, you need to multiply 20 by 1.04. This gets you $20.8.

If you are talking about compound interest, we will take this number and multiply it again by 1.04 for the second year. 20.8 x 1.04 = $21.632.

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2 years ago

Henry buys a large boat for the summer, however he cannot pay the full amount of $32,000 at

Anna007 [38]

Answer:

Monthly payments=$418.14

Total amount will be=down payment + 48×$418.14

$14000+$20070.84=$34070.84

Step-by-step explanation:

Loan payment per month=Amount to pay÷discount factor

Mathematically P=A÷D

where D is the discount factor calculated using the formula;

$\frac{(1+i)^n-1}{i(1+i)^n}$

where i=periodic interest rate=annual rate divided by number of payment periods

A is the amount to pay after downpayment

P is the loan monthly payment amount

n=number of periodic payments=payments per year times number of years

⇒In this question you find the discount factor then divide the amount remaining to pay with the discount factor to get monthly payments

Given;

Cost of boat=$32000

Down payment=$14000

Loan to pay=$32000-$14000=$18000

Annual rate=5.5%=i=5.5%÷12=0.458%⇒0.00458

Periodic payments, n=4×12=48

Finding the discount factor D;

$D=\frac{(1+i)^n-1}{i(1+i)^n} \\\\\\D=\frac{(1+0.00458)^{48} -1}{0.00458(1+0.00458)^{48} } \\\\\\D=\frac{1.2455-1}{0.005703} \\\\\\D=\frac{0.2455}{0.005703} =43.05$

To get the amount to pay monthly divide the loan to pay with the discount factor

$=\frac{18000}{43.05} =418.14$

Monthly payments=$418.14

Total amount will be=down payment + 48×$418.14

$14000+$20070.84=$34070.84

8 0

3 years ago

Someone please help me I'm confused​

Someone please help me I'm confused