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MArishka [77]
3 years ago
10

Convert the following into scientific notation: 70.2 = _____ x 10 ____

Mathematics
2 answers:
ElenaW [278]3 years ago
8 0

Answer:

7.02 x 10^1

Step-by-step explanation:

viva [34]3 years ago
5 0

Answer:

7.02 * 10^1

Step-by-step explanation:

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Been stuck on this one for a while will give brainiest plus this question is worth 20 points im desperate
bulgar [2K]

Answer:

the scale factor is 25, 3000/125 scaled down,

Step-by-step explanation:

you can also explain this with a 25:1 ratio, 25 inches from the original scaled to 1 inch for the photo copy.

7 0
2 years ago
A box contains 5 red and 5 blue marbles. Two marbles are withdrawn randomly. If they are the same color, then you win $1.10; if
topjm [15]

Answer:

a) The expected value is \frac{-1}{15}

b) The variance is  \frac{49}{45}

Step-by-step explanation:

We can assume that both marbles are withdrawn at the same time. We will define the probability as follows

#events of interest/total number of events.

We have 10 marbles in total. The number of different ways in which we can withdrawn 2 marbles out of 10 is \binom{10}{2}.

Consider the case in which we choose two of the same color. That is, out of 5, we pick 2. The different ways of choosing 2 out of 5 is \binom{5}{2}. Since we have 2 colors, we can either choose 2 of them blue or 2 of the red, so the total number of ways of choosing is just the double.

Consider the case in which we choose one of each color. Then, out of 5 we pick 1. So, the total number of ways in which we pick 1 of each color is \binom{5}{1}\cdot \binom{5}{1}. So, we define the following probabilities.

Probability of winning: \frac{2\binom{5}{2}}{\binom{10}{2}}= \frac{4}{9}

Probability of losing \frac{(\binom{5}{1})^2}{\binom{10}{2}}\frac{5}{9}

Let X be the expected value of the amount you can win. Then,

E(X) = 1.10*probability of winning - 1 probability of losing =1.10\cdot  \frac{4}{9}-\frac{5}{9}=\frac{-1}{15}

Consider the expected value of the square of the amount you can win, Then

E(X^2) = (1.10^2)*probability of winning + probability of losing =1.10^2\cdot  \frac{4}{9}+\frac{5}{9}=\frac{82}{75}

We will use the following formula

Var(X) = E(X^2)-E(X)^2

Thus

Var(X) = \frac{82}{75}-(\frac{-1}{15})^2 = \frac{49}{45}

7 0
3 years ago
3y -7y + 18x + y + 21x + 9 - 13 Simplify the expression
Leviafan [203]

Answer:

-3y+39x-4

Step-by-step explanation:

3y minus 7y plus y is -3y. 18x plus 21x is 39x. 9 minus 13 is -4

7 0
3 years ago
Divide in simplest form. 11/12 ➗3/4 <br> PLZZ HELP THIS IS A QUIZ I REPETE THIS IS A QUIZ!!
Lapatulllka [165]

Answer:

11/9

Step-by-step explanation:

It's called a calculator

Pls give Brainliest!!

3 0
3 years ago
Read 2 more answers
Which number can be used as a common denominator for the fractions 1/4 and 5/6? Check all that apply.
Juli2301 [7.4K]
You could either use 12 or 24.
6 0
3 years ago
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