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Katena32 [7]
3 years ago
13

Simplify 7 – (–12) – 5

Mathematics
1 answer:
kherson [118]3 years ago
5 0

Answer:

14

Step-by-step explanation:

1. Do the "Two Mark" Rule

    -  7 + (+12) - 5

2. Do your addition before subtracting

    - 7 + 12 = 19

3. Subtract your remaining two numbers

   -  19 - 5 = 14

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24 yellow strips

Step-by-step explanation:

since you need two yellow for every blue, you need to double the total of blue to get the number of yellow that are needed.

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A trampoline has an area of 49pi square feet what's the diameter of the trampoline
Anna007 [38]
Area of a circle is π*r²
sub what we're given 
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Suzy is shopping at a book sale.The table show prices for paperback books.
Salsk061 [2.6K]

<em>Answer:</em>

<em>6,9</em>

<em>Step-by-step explanation:</em>

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3 0
2 years ago
When parking a car in a downtown parking lot, drivers pay according to the number of hours or fraction thereof. The probability
Zigmanuir [339]

Answer:

u = 4.604 , s = 2.903

u' = 23.025 , s' = 6.49

Step-by-step explanation:

Solution:

- We will use the distribution to calculate mean and standard deviation of random variable X.

- Mean = u = E ( X ) = Sum ( X*p(x) )

 u = 1*0.229 + 2*0.113 + 3*0.114 + 4*0.076 + 5*0.052 + 6*0.027 + 7*0.031 + 8*0.358.

 u = 4.604

- Standard deviation s = sqrt ( Var ( X ) = sqrt ( E ( X^2) + [E(X)]^2

 s = sqrt [ 1*0.229 + 4*0.113 + 9*0.114 + 16*0.076 + 25*0.052 + 36*0.027 + 49*0.031 + 64*0.358 - 4.604^2 ]

s = sqrt ( 8.429184 )

s = 2.903          

- We will use properties of E ( X ) and Var ( X ) as follows:

- Mean = u' = E (Rate*X) = Rate*E(X) = $5*u =

               u' = $5*4.605

               u' = 23.025

- standard deviation = s' = sqrt (Var (Rate*X) ) = sqrt(Rate)*sqrt(Var(X)) = sqrt($5)*s =

               s' = sqrt($5)*2.903

               u' = 6.49

3 0
3 years ago
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