1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
photoshop1234 [79]
2 years ago
15

Please help with this question if possible.

Mathematics
1 answer:
alexandr1967 [171]2 years ago
3 0
Volume of the large pyramid = 1/3*(10)² *30= 1000 cm³
Height of the small pyramid that was cut = 30-15=15 cm
Volume of the small pyramid = 1/3*(5)²*15=125 cm³

Volume of the frustum = Volume large pyramid - volume small pyramid=
=1000-125=875 cm³
Answer is 875 cm³.

You might be interested in
At noon, ship A is 130 km west of ship B. Ship A is sailing east at 25 km/h and ship B is sailing north at 20 km/h. How fast is
Hitman42 [59]

Answer:

answer = 12.87 km/h

Step-by-step explanation:

Given

Ship A is sailing east at 25 km/h = \frac{dx}{dt}

ship B is sailing north at 20 km/h =\frac{dy}{dt}

here x and y are the  sailing at t = 4 : 00 pm for ship A and B respectively

so we get x = 4 ×25 =100 km/h

                 y = 4× 20 = 80 km/h

let z is the distance between the ships, we need to find \frac{dz}{dt} at t = 4 hr

At noon, ship A is 130 km west of ship B (12:00 pm)

so equation will be

z^2 = (130-x)^2 + y^2......................(i)\\put x = 100 and y = 80 \\\\we |  | get \\

z^2 = 30^2 + 80^2\\z =\sqrt{7300} km/h

derivative first equation w . r. to t we get

2z\frac{dz}{dt} =-2(130-x)\frac{dx}{dt}+2y\frac{dy}{dt}

\frac{dz}{dt} =\frac{1}{z}[(x -130)\frac{dx}{dt} +y\frac{dy}{dt}]

\frac{dz}{dt} = \frac{( -20\times25 + 80\times20)}{\sqrt{7300} }

     = \frac{1100}{85.44}\\  = 12.87km/h

8 0
3 years ago
PLS HELP I WILL GIVE BRAINLIEST
Luden [163]

Answer:

2.6

Step-by-step explanation:

I did the test and it was correct

5 0
2 years ago
Read 2 more answers
The School has budgeted $3,500 for an end- of -year party in the local park. The cost to rent the park shelter is $250. How much
Arisa [49]

Answer:

$5.3

Step-by-step explanation:

<u>1) Ask yourself: How much money is left to spend? </u>

<em>- Subtract the cost to rent the park shelter: </em>

3,500 - 250 = 3,250

<em>- Find the total amount of money spent on gifts for students:   </em>

300 * 5.50 = 1,650  

<em>- Subtract the total money spent on gifts for students: </em>

3,250 - 1,650 = 1,600

<u>2) Ask yourself: How much can be spent </u><u>per student</u><u>? </u>

<em>- Divide the money left by the number of students: </em>

1,600 / 300 = 5.3

7 0
2 years ago
What are the solutions of the equation 9x4 – 2x2 – 7 = 0? Use u substitution to solve. tions of the equation 9
skelet666 [1.2K]

Answer:

Step-by-step explanation:

Let u^2=x^4\\u = x^2

Subbing in:

9u^2-2u-7=0

a = 9, b = -2, c = -7

The product of a and c is the aboslute value of -63, so a*c = 63.  We need 2 factors of 63 that will add to give us -2.  The factors of 63 are {1, 63}, (3, 21}, {7, 9}.  It looks like the combination of -9 and +7 will work because -9 + 7 = -2.  Plug in accordingly:

9u^2-9u+7u-7=0

Group together in groups of 2:

(9u^2-9u)+(7u-7)=0

Now factor out what's common within each set of parenthesis:

9u(u-1)+7(u-1)=0

We know this combination "works" because the terms inside the parenthesis are identical.  We can now factor those out and what's left goes together in another set of parenthesis:

(u-1)(9u+7)=0

Remember that u=x^2

so we sub back in and continue to factor.  This was originally a fourth degree polynomial; that means we have 4 solutions.

(x^2-1)(9x^2+7)=0

The first two solutions are found withing the first set of parenthesis and the second two are found in other set of parenthesis.  Factoring (x^2-1) gives us that x = 1 and -1.  The other set is a bit more tricky.  If

9x^2+7=0 then

9x^2=-7 and

x^2=-\frac{7}{9}

You cannot take the square root of a negative number without allowing for the imaginary component, i, so we do that:

x=±\sqrt{-\frac{7}{9} }

which will simplify down to

x=±\frac{\sqrt{7} }{3}i

Those are the 4 solutions to the quartic equation.

5 0
3 years ago
Two numbers total 32 and have a difference of 10 what are the two numbers
Vlada [557]

Answer:

21 & 11

Step-by-step explanation:

Let x = first number and y = second number. We need to find the values of x and y, so we need to set up a system of linear equations. The first equation would be x + y = 32 because x and y add up to 32. Then the second equation would be x - y = 10 to represent that the two numbers have a difference of 10. Solving by elimination, we add and get 2x = 42, so x = 21. Then substitute 21 for x in either one of the equations to get y = 11.

3 0
2 years ago
Other questions:
  • PLEASE HELP ASAP 25 PTS + BRAINLIEST TO RIGHT/BEST ANSWER
    6·1 answer
  • A line passes through the points (6, 10) and (4, -2). What is the equation of the line
    13·2 answers
  • What is 5/6 in simplest form
    15·2 answers
  • Does anyone know how to solve this ?
    12·2 answers
  • Which of these is equal to 35 (8 – 3)? A. (35 + 8) – (35 + 3) B. (35 × 8 ) + (35 × 3) C. (35 × 8) – (35 × 3) D. (35 × 11)
    11·1 answer
  • Point P has coordinates (1,3). Point Q has coordinates (25,10). How long is segment PQ?
    11·1 answer
  • Which of the following expressions is equivalent to5(x +10) +x ? Select all that apply . A.5x + 10 + x B. 5x + 50 + x C.6x + D.5
    9·1 answer
  • If &lt;1 and &lt;2 are vertical angels and m&lt;1 = 180, find &lt;2
    14·2 answers
  • Find £83.70 as a percentage of £167.40
    7·2 answers
  • Can anyone solve this?
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!