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Sergeu [11.5K]
3 years ago
13

If Harriet rolls the number cube 39 times, how many times can she expect to roll a 3 or 4?

Mathematics
1 answer:
lara31 [8.8K]3 years ago
3 0

Answer:

13 times

Step-by-step explanation:

P(3 or 4) = 1/3, so she can expect to roll a 3 or 4 13 times

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The sum of an infinite geometric series is 450, while the common ratio of the series is 4/ 5 . What is the first term of the ser
pogonyaev

Answer:

answer is 90 for first term

Step-by-step explanation:

Let the terms be  

First term x

We will use the formula s∞=x/1−r to find the sum of an infinite geometric series, where −1<r<1.  

We know the sum and the common ratio, so we'll be solving for x where r =4/5

s∞=x/1−r

450=x/1−4/5

450=x/1/5

450=5x

x=90

this is the first term x1 = 90

we know that common ratio is 4/5, so multiplying the first term by factor 4/5 to get the second term  

90 x 4/5=   72 second term  

7 0
3 years ago
Read 2 more answers
-3x^2 – 24x – 13 = -13
Fudgin [204]
\begin{gathered} -3x^2-24x-13=-13 \\ \text{ Express it as:} \\ 3x^2+24x+26=0 \\ 3x^2+24x=-26 \\ 3(x^2+8x+16)=?-26 \\ 3(x+4)^2=48-26 \\ 3(x+4)^2=22 \end{gathered}

oh,

3 0
1 year ago
Who can solve this in 1 min 5678÷78
andreev551 [17]

It is 72.7948718

~Hope that helped!~

~Izzy <3

5 0
3 years ago
If X=2<br> y=-1<br> z=3 <br>Find the value of<br><br><br>a. 2y3(cube) z2(square)​
qaws [65]

Step-by-step explanation:

2y³z²

2(-1)³(3)²

=2(-1)(9)

=-18

6 0
3 years ago
Find x. problem is in picture
Masja [62]

Answer:

x=21

Step-by-step explanation:

We know that C is a right angle, which means that x + 3x+6 = 90

4x+6=90\\4x=84\\x=21

Have a nice day. hope I helped please rate brainliest!

3 0
3 years ago
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