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3 years ago

How do you do these problems?

Mathematics

2 answers:

tangare [24]3 years ago

8 0

You are supposed to count the amount of faces, vertices and edges
Example: A square pyramid has 5 faces, 5 vertices and 8 edges

Hope this helps!

Inessa05 [86]3 years ago

6 0

You count how many faces, verticles, and edges it has.

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A pet home owner wants to keep the ratio of cats to dogs at 3:5. She has 21 cats, how many dogs are there in the pet home?

klemol [59]

Answer:

There are 35 dogs in the pet home.

Step-by-step explanation:

3:5 is the ratio, 3 being cats and 5 being dogs

Since there are 21 cats, you would do 21/3 to find the ratio value - which is 7

Now, multiply 5 times 7 to get the amount of dogs, which is 35.

7 0

3 years ago

Read 2 more answers

You have $4000 to invest. If you'd like to earn exactly $638

Natali [406]

Answer:

8%: $1554

21%: $2446

Step-by-step explanation:

This is a simple interest problem.

The simple interest formula is given by:

$E = P*I*t$

In which E are the earnings, P is the principal(the initial amount of money), I is the interest rate(yearly, as a decimal) and t is the time.

After t years, the total amount of money is:

$T = E + P$ .

In this question:

Two earnings, that i am going to call A(8% per year) and B(21% per year).

Two principals, for A i am going to call P and for B it is the rest, so 4000 - P.

One year, so $t = 1$

8% interest, so $r = 0.08$

Earnings A.

$A = P*I*t$

$A = 0.08P$

21% interest, so $r = 0.21$

Principal (4000 - P).

$B = P*I*t$

$B = 0.21*(4000 - P)$

You'd like to earn exactly $638 in interest each year.

This means that $A + B = 638$

Then

$B = 638 - A$

Now we have to solve the following system:

$A = 0.08P$

$638 - A = 0.21*(4000 - P)$

So, on the second equation:

$A = 638 - 0.21*(4000 - P)$

Replacing on the first:

$A = 0.08P$

$638 - 0.21*(4000 - P) = 0.08P$

$638 - 840 + 0.21P = 0.08P$

$0.21P - 0.08P = 840 - 638$

$0.13P = 202$

$P = \frac{202}{0.13}$

$P = 1553.8$

Rounding up to the nearest integer

P = 1554.

So on A, the 8% interest, you invest $1554.

On B, the 21% interest, you invest 4000 - 1554 = $2446.

5 0

3 years ago

Please please help me

Studentka2010 [4]

Answer:

?=38

average rate of change =3 (on the way they partitioned the x's)

Step-by-step explanation:

This is a line because it has the same rise/run ( $\frac{y_2-y_1}{x_2-x_1}$ ) per pair of points.

That is, the following are equal:

$\frac{17-5}{2-(-2)}=\frac{26-17}{5-2}$

$\frac{12}{4}=\frac{9}{3}$

$3=3$

The slope (also called the rate of change) is 3.

This means the calculating of the last pair of points should have the same rise/run.

That is we should have:

$\frac{?-26}{9-5}=3$

$\frac{?-26}{4}=3$

Multiply both sides by 4:

$?-26=12$

Add 26 on both sides:

$?=12+26$

$?=38$

5 0

4 years ago

Hassan and Tamika are helping their friend Cai move. If Hassan can move 4 boxes for every 12 boxes that Tamika moves, then how m

slavikrds [6]

The computation shows that Tamika can move 3 boxes for every box that Hassan moves.

<h3>How to illustrate the information?</h3>

From the information, it was stated that Hassan can move 4 boxes for every 12 boxes that Tamika moves.

Therefore, the number of boxes that Tamika can move for every box that Hassan moves will be:

= 12/4

= 3

Therefore, Tamika can move 3 boxes for every box that Hassan moves.

Learn more about computations on:

brainly.com/question/4658834

#SPJ1

3 0

2 years ago

Find the volume with radius 4 m and height 4 m .Use pencil and paper. How does the volume change when the height is tripled? Whe

VikaD [51]

Answer:

Step-by-step explanation:

3 0

3 years ago