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3 years ago

Which is the correct answer and pls explain why

Mathematics

1 answer:

Elina [12.6K]3 years ago

7 0

I think n2+2
and i don’t really know how to explain

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Can someone that's very good at math please help me?

gtnhenbr [62]

Answer:

35 :

t = 6.25 years

(about 6 years 3 months)

Equation:

t = (1/r)(A/P - 1)

Calculation:

First, converting R percent to r a decimal

r = R/100 = 4%/100 = 0.04 per year,

then, solving our equation

t = (1/0.04)((2500/2000) - 1) = 6.25

t = 6.25 years

The time required to get a total amount, principal plus interest, of $2,500.00 from simple interest on a principal of $2,000.00 at an interest rate of 4% per year is 6.25 years (about 6 years 3 months).

36:

The two distances are the same (out and back), so set them equal.

That is done by having a (rate)(time) equal a (rate)(time).

One time is “x” and the other is “4.8-x.”

One rate is 460 and the other is 500.

460 x = 500 (4.8 -x)

460 x = 2400 - 500x

900 x = 2400

x = 2.5 hours for the slower plane.

4.8- x = 2.3 hours for the faster plane.

8 0

3 years ago

What number must be added to the expression below to complete the square

EastWind [94]

Where is it? In order to help you I need to see what the problem is.

3 0

3 years ago

If f(x)= x^2 - x+ 1 and f (-1), then the result is

OLEGan [10]

Answer:

Step-by-step explanation:

To solve f(-1), entails to replace x by -1 in the function

f(-1)= (-1)^2 - (-1)+ 1

= 1 + 1 + 1

= 3

6 0

2 years ago

Plsssss help me with this angle circle problem what is x

kirza4 [7]

Answer:

x = 3

Step-by-step explanation:

Once again we want to use the relationship stated earlier

Where A * B = C * D

Once again imagine that the segments in the given problem have letters

A = x

B = 12

C = x + 1

D = 9

Now we create an equation using the relationship

12 * x = 9(x+1)

now we solve using basic algebra

step 1 distribute the 9 to the x and the 1

9 * x = 9x

9 * 1 = 9

now we have 12x = 9x + 9

step 2 subtract 9x from each side

12x - 9x = 3x

9x - 9x cancels out

now we have 3x = 9

step 3 divide each side by 3

3x/3=x

9/3=3

we're left with x = 3

4 0

3 years ago

Read 2 more answers

Find the volume of the cone. Round your answer to the nearest tenth if necessary. Use 3.14 for π.

pashok25 [27]

200.96 cm^3

Step-by-step explanation:

The equation for the volume of a cone is...

$V=\frac{1}{3}\pi r^2h$

Since we are using 4 for the radius we can plug that in, along with 12 for the height and 3.14 for pi.

So the equation with everything plugged in will be...

$V=\frac{1}{3}*3.14*4*4*12$

Now we can solve.

$V=200.96$

The volume of the cone is...

200.96 cm^3

8 0

2 years ago