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3 years ago

1. There are 26 letters in the alphabet. If A = 1 and Z = 26, what is the sum of B and Y?

Mathematics

2 answers:

N76 [4]3 years ago

5 0

1. 27 (2+25)

2. 10 (3+7)

3. 29 (13+16)

4. 30.48 (12x2.54)

Pls mark branliest if this helped.

Grace [21]3 years ago

3 0

Oh yeah he’s right. Just scroll up from my answer to see the correct answer.

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The battery standby duration (in hours) of a new model of cell phone is known to be normally distributed. Ten pieces of such new

Stells [14]

x = number of hours

want to find probability (P) x >= 13

x is N(14,1) transform to N(0,1) using z = (x - mean) / standard deviation so can look up probability using standard normal probability table.

P(x >= 13) = P( z > (13 - 14)/1) = P(z > -1) = 1 - P(z < -1) = 1 - 0.1587 = 0.8413

To convert that to percentage, multiply 100, to get 84.13%

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3 years ago

If f(x) = 3x + 3, then f-1(x) =

tensa zangetsu [6.8K]

Mathematically, when you calculate the inverse function (f-1(x)), you’re switching the “inputs” (x) and the “outputs” (f(x)) and then re-solving the equation. So, you’d start with something like:

x = 3*f-1(x) + 3
x - 3 = 3*f-1(x)
(x - 3)/3 = f-1(x)

Your inverse formula would be (x - 3)/3. Hope this helps! (Hopefully Brainly doesn’t mess up the text format.)

7 0

4 years ago

A theater sells tickets for a concert. Tickets for lower-level seats sell for $55 each, and tickets for upper-level seats sell f

Alex

Answer: Lower level tickets = 85

Upper level tickets = 156

Step-by-step explanation: The first thing we shall do is assign letters to the unknown variables. We'll start by calling the lower level tickets L, and the upper level tickets P.

Next is we use the clues we've been given. Since the theater sold 241 tickets, we can write the expression

L + P = 241 ---------------- (1)

Next thing we're told is that lower level tickets were sold for $55 while upper level tickets were sold for $30. If total ticket sales was $9355, then we can write another expression

55L + 30P = 9355 -------(2)

We now have a pair of simultaneous equations

L + P = 241 ---------------------(1)

55L + 30P = 9355 ---------(2)

From equation (1), we shall make L the subject of the equation

L = 241 - P

Substitute for the value of L in equation (2), we now have

55(241 - P) + 30P = 9355

13255 - 55P + 30P = 9355

Collecting like terms we now have

13255 - 9355 = 55P - 30P

(Note that when a positive value crosses from one side of the equation to the other side, it becomes negative, and vice versa.

3900 = 25P

Divide both sides of the equation by 25

156 = P.

This means upper level tickets sold were 156 in number.

Substitute for the value of P in equation (1)

L + P = 241

L + 156 = 241

Subtract 156 from both sides of the equation

L + 156 - 156 = 241 - 156

L = 85

Therefore, lower level tickets sold were 85 and

Upper level tickets sold were 156

5 0

4 years ago

The order of transformations in a sequence matters; reversing the order will not necessarily give the same image. Is this statem

Kamila [148]

Answer:

I think true I'm not sure

4 0

3 years ago

Read 2 more answers

Write an equivalent expression for each question

Mandarinka [93]

Answer:

A. 16 - 4 x = 4(4 - x)

B. 4 x + 8 = 4( x + 2)

C. -8 b - 24 = -8(b + 3)

D. 54 + 9 x = 9 (x + 6)

Step-by-step explanation:

Here, the given expressions are:

A. 16 - 4 x

Now, 16 and 4 have 4 as their COMMON FACTOR.

⇒Taking out 4 as the factor, we get: 16 - 4 x = 4 ( 4 - x)

Hence, the equivalent expression of 16 - 4 x = 4 ( 4 - x)

B. 4x + 8

Now, 4 and 8 have 4 as their COMMON FACTOR.

⇒Taking out 4 as the factor, we get: 4 x + 8 = 4 ( x + 2)

Hence, the equivalent expression of 4 x + 8 = 4 ( x + 2)

C. -8b - 24

Now, -8 and -24 have (-8) as their COMMON FACTOR.

⇒Taking out (-8) as the factor, we get: -8b - 24 = (-8) ( b+ 3)

Hence, the equivalent expression of -8b - 24 = (-8) ( b+ 3)

D. 54 + 9x

Now, 54 and 9 have (9) as their COMMON FACTOR.

⇒Taking out (9) as the factor, we get: 54 + 9 x = 9( 6 + x)

Hence, the equivalent expression of 54 + 9 x = 9( 6 + x)

4 0

3 years ago