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Yuri [45]
4 years ago
6

in class of 24 students, 13 students sold over 150 raffle tikets each, and the rest of the class sold about 60 tikets each. the

class goal was to sell 2,000 tikets. did they rach their goal?
Mathematics
2 answers:
dezoksy [38]4 years ago
8 0
To find the answer we have to calculate total tickets.
We know that 13 students sold 150 tickets and rest sold 60 each.
First I want to find ticket sold by 13 student, so
13*150=1950
Rest of class is 24-13=11
Ticket sold by rest of class is
11*60=660
Total sold ticket is
1950+660=2610 they rich their goal
zheka24 [161]4 years ago
4 0

In class of 24 students, 13 students sold over 150 raffle tikets each and 24-13=11 students sold about 60 tikets each.

1. If 13 students sold over 150 raffle tikets each, then together they sold over 13·150=1950 raffle tikets.

2. If 11 students sold about 60 tikets each, then together they sold about 11·60=660 raffle tikets.

3. All together they sold about 1950+660=2610 raffle tikets. Since 2610>2000, they had achieved their goal.

Answer: yes.

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350% of 880 is 60% of what number?
Westkost [7]

Answer:

5133 1/3

Step-by-step explanation:

3.5 \cdot 880 = 0.6x\\3080=0.6x\\x=5133 1/3

Hope this helps!

6 0
3 years ago
A = ???? 4 −2
irinina [24]

Answer:

1. The matrix A isn't the inverse of matrix B.

2. |B|=12, |A|=12

Step-by-step explanation:

1. We want to know if matrix A is the inverse of matrix B, this means that if you do the product between B and A you have to obtain the identity matrix.

We have:

A=\left[\begin{array}{cc}4&-2\\-1&3\end{array}\right]

and

B=\left[\begin{array}{cc}3&2\\1&4\end{array}\right]

A and B are 2×2 matrices (2 rows and 2 columns), if you multiply them you have to obtain a 2×2 matrix.

Then if A is the inverse of B:

B.A=I

Where,

I=\left[\begin{array}{cc}1&0\\0&1\end{array}\right]

Observation:

If you have two matrices:

A=\left[\begin{array}{cc}a&b\\c&d\end{array}\right]\\and\\B=\left[\begin{array}{cc}e&f\\g&h\end{array}\right]\\\\\\A.B=\left[\begin{array}{cc}(a.e+b.g)&(a.f+b.h)\\(c.e+d.g)&(c.f+d.h)\end{array}\right]

Now:

B.A=\left[\begin{array}{cc}3&2\\1&4\end{array}\right].\left[\begin{array}{cc}4&-2\\-1&3\end{array}\right]\\\\\\B.A=\left[\begin{array}{cc}4.3+(-2).1&4.2+(-2).4\\(-1).3+3.1&(-1).2+3.4\end{array}\right]\\\\\\B.A=\left[\begin{array}{cc}12-2&8-8\\-3+3&-2+12\end{array}\right]\\\\\\B.A=\left[\begin{array}{cc}10&0\\0&10\end{array}\right]

B.A=\left[\begin{array}{cc}10&0\\0&10\end{array}\right]\neq \left[\begin{array}{cc}1&0\\0&1\end{array}\right]=I\\\\\\B.A\neq I

Then, the matrix A isn't the inverse of matrix B.

2. If you have a matrix A:

A=\left[\begin{array}{cc}a&b\\c&d\end{array}\right]

The determinant of the matrix is:

|A|=ad-bc

Then the determinant of B is:

B=\left[\begin{array}{cc}3&2\\1&4\end{array}\right]

a=3, b=2, c=1, d=4

|B|=3.4-2.1\\|B|=12-2=10

The determinant of A is:

A=\left[\begin{array}{cc}4&-2\\-1&3\end{array}\right]

a=4, b=-2, c=-1, d=3

|A|=4.3-(-2).(-1)\\|B|=12-2=10

6 0
4 years ago
PLEASE HELP <br> WILL GIVE BRAINLIEST AND 5.0 RATING
qaws [65]

Answer:

you land 5 ,5

Step-by-step explanation:

-2 five is at the left of negative then go up 5 times  then move to the right 7 times which will land you at 5,5

5 0
2 years ago
The terminal ray of angle A passes through the point (- 4, - 6)
kow [346]

Answer: -√13/3

Step-by-step explanation:

I answered wrong on my test this was the answer

5 0
3 years ago
A sphere just fits inside a cube with edges 20 in. Long. What is the volume of the sphere? What is the volume of the cube? What
yuradex [85]

Answer:

Step-by-step explanation:

Volume of a cube = (side)³

                              = (20)³

                              = 8000 cubic in.

Volume of the sphere which just fits in = \frac{4}{3}\pi r^{3}

Here, r = Radius of the sphere

Since, sphere just fits in, radius of the sphere = half of the dimension of the cube

r = \frac{20}{2}

r = 10 in

Therefore, volume of the sphere = \frac{4}{3}\pi (10)^3

                                                        = 4188.79 cubic inch

Volume of the space between the cube and sphere = 8000 - 4188.79

                                                                                       = 3811.21 cubic inch

5 0
3 years ago
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