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
Ad libitum [116K]
3 years ago
13

Please help me I don’t know how to do this and it is due at 10:00 please help

Mathematics
2 answers:
BabaBlast [244]3 years ago
8 0

Answer:

9. 1/2÷1/4

=1/2×4

=2

10. 1/12÷5/6

=1/12×6/5

=1/10

11. 5/6÷5/9

=5/6×9/5

=3/2

12.2 2/3%

=8/3%

=8/300

=2/75

=0.02666667

Blizzard [7]3 years ago
4 0

Answer:

number 12 is

\frac{3}{125}

You might be interested in
Events a, b, and c in a sample space have p(a)=0.2, p(b)=0.4, and p(c)=0.1. find p(a ∪ b ∪
Julli [10]
If A and B are mutually independent, then \mathbb P(A\cup B)=\mathbb P(A)+\mathbb P(B) and \mathbb P(A\cap B)=0.

If A and C are independent, then \mathbb P(A\cap C)=\mathbb P(A)\cdot\mathbb P(C). Ditto for B and C.

The inclusion/exclusion principle says that

\mathbb P(A\cup B\cup C)=\mathbb P(A)+\mathbb P(B)+\mathbb P(C)-\mathbb P(A\cap B)-\mathbb P(A\cap C)-\mathbb P(B\cap C)+\mathbb P(A\cap B\cap C)

Since A and B are mutually exclusive, their intersection is the empty set. It then follows that A\cap B\cap C also is the empty set, so the last probability is also 0.

Plug in what we know:

\mathbb P(A\cup B\cup C)=0.2+0.4+0.1-0-0.2\cdot0.1-0.4\cdot0.1+0

\implies\mathbb P(A\cup B\cup C)=0.64
3 0
3 years ago
Use the X method to find the solutions of<br> 62 + 2x - 20 = 0.
inysia [295]

Answer:

x = -21

Step-by-step explanation:

62 + 2x - 20 = 0.

Combine like terms

42 +2x =0

Subtract 42 from each side

42-42 +2x = 0-42

2x = -42

Divide each side by 2

2x/2 = -42/2

x = -21

3 0
3 years ago
Read 2 more answers
Which rules of exponents will be used to evaluate this expression? Check all that apply. StartFraction left-brace (negative 8) S
ExtremeBDS [4]
Answer:
X product of powers
Quotient of powers
Power of a power
X power of a product
Negative exponent
X zero exponent

Hope this helps ʕ•ᴥ•ʔ
5 0
3 years ago
Isabella has twice as much money invested at 4% as she has invested at 3%, and she has $500 more invested at 5% than she has at
adell [148]
Invested at 3% = x
invested at 4% = 2x
invested at 5% = x+500

0.03x + 0.04(2x) + 0.05(x+500) = 2025
0.03x + 0.08x +0.05x +25 = 2025
0.16x = 2000
x= 12,500
4% = 2x = 12,500 * 2 = $25,000
3 0
3 years ago
Calculate the sample mean and sample variance for the following frequency distribution of heart rates for a sample of American a
spin [16.1K]

Answer:

Mean = 68.9

s^2 =18.1 --- Variance

Step-by-step explanation:

Given

\begin{array}{cccccc}{Class} & {51-58} & {59-66} & {67-74} & {75-82} & {83-90} \ \\ {Frequency} & {6} & {3} & {11} & {13} & {4} \ \end{array}

Solving (a): Calculate the mean.

The given data is a grouped data. So, first we calculate the class midpoint (x)

For 51 - 58.

x = \frac{1}{2}(51+58) = \frac{1}{2}(109) = 54.5

For 59 - 66

x = \frac{1}{2}(59+66) = \frac{1}{2}(125) = 62.5

For 67 - 74

x = \frac{1}{2}(67+74) = \frac{1}{2}(141) = 70.5

For 75 - 82

x = \frac{1}{2}(75+82) = \frac{1}{2}(157) = 78.5

For 83 - 90

x = \frac{1}{2}(83+90) = \frac{1}{2}(173) = 86.5

So, the table becomes:

\begin{array}{cccccc}{x} & {54.5} & {62.5} & {70.5} & {78.5} & {86.5} \ \\ {Frequency} & {6} & {3} & {11} & {13} & {4} \ \end{array}

The mean is then calculated as:

Mean = \frac{\sum fx}{\sum f}

Mean = \frac{54.5*4+62.5*3+70.5*11+78.5*13+86.5*4}{6+3+11+13+4}

Mean = \frac{2547.5}{37}

Mean = 68.9 -- approximated

Solving (b): The sample variance:

This is calculated as:

s^2 =\frac{\sum (x - \overline x)^2}{\sum f - 1}

So, we have:

s^2 =\frac{(54.5-68.9)^2+(62.5-68.9)^2+(70.5-68.9)^2+(78.5-68.9)^2+(86.5-68.9)^2}{37 - 1}

s^2 =\frac{652.8}{36}

s^2 =18.1 -- approximated

5 0
3 years ago
Other questions:
  • You mow 1/3 of the lawn. Your sister mows 2/7 of the lawn. What fraction of the lawn is mowed?
    5·2 answers
  • The area of the rectangle is 24x^5y^3 square units. Find the length of the rectangle.
    8·1 answer
  • Case 4 – House Price. A small data set contains information on House Price (Y) in dollars, as well as predictors: number of Cars
    15·1 answer
  • What is the surface area of the cone? (Use 3.14 for π.)
    13·2 answers
  • The lcd for fractions 1/3 3/4 and 8/9 is
    14·1 answer
  • Given PQRS is a parallelogram, solve for x and y. Then solve for m
    13·1 answer
  • A water pumps 40 gallons a minute. How long will it take to empty a 2,000 gallon tank?
    15·1 answer
  • Can u pls help me with this question ​
    12·1 answer
  • Wich one is bigger 4\5 or 0.8
    5·2 answers
  • A large car dealership claims that 47% of its customers are looking to buy a sport utility vehicle (SUV). A random sample of 61
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!