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3 years ago

Which expressions are equivalent to 3(-2a-4-)+3a

Mathematics

1 answer:

svetlana [45]3 years ago

6 0

Answer:

−6a−12+3a

Step-by-step explanation:

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A triangular brace has an angle measure of 30 degrees, with a side opposite this angle measuring 8 inches. The base of the trian

Ad libitum [116K]

Answer:

Step-by-step explanation:

according to sine rule,

sin(30)/8=sin(x)/11

solving above equation will give

x=43.3

7 0

3 years ago

The scheduled arrival time for a daily flight from Boston to New York is 9:30 am. Historical data show that the arrival time fol

Galina-37 [17]

Answer:

Step-by-step explanation:

Let x be a random variable representing the flight arrival time from Boston to New York.

For a uniform probability distribution, the notation is

X U(a, b) where a is the lowest value of x and b is the lowest value of x

The probability density function, f(x) = 1/(b - a)

Mean, µ = (a + b)/2

Standard deviation, σ = √(b - a)²/12

From the information given, the time difference in minutes is 9:57 - 9:07 = 50 minutes. Therefore,

a = 0

b = 50

µ = (0 + 50)/2 = 25

σ = √(50 - 0)²/12 = 14.43

b) converting to minutes, it is 9:30 - 9:07 = 23 minutes

the probability that a flight arrives late(later than 9:30 am) is expressed as P(x > 23)

f(x) = 1/(50) = 0.02

P(x > 23) = (50 - 23)0.02 = 0.54

7 0

2 years ago

Which shows the repeated multiplication for 9³?

mariarad [96]

its A. because the exponent which in this case is 3, is multiplied 3 times. so 9 is multiplied 9 times

6 0

2 years ago

Read 2 more answers

(Please make sure your answer is 100% correct and Accurate)

I am Lyosha [343]

It would be 7813.50.

3 0

2 years ago

Look at picture <br>y=_<br><br>the height of the baseball after 5 seconds is ___ feet

Wittaler [7]

Answer:

y = -2(x -3)² +24
16 feet

Step-by-step explanation:

We expect the equation for y to be quadratic. Since the table is obviously symmetrical about x=3, we can start with the vertex form ...

y = a(x -3)² +b

Filling in the values from the first two table points, we get

For (x, y) = (0, 6):

6 = a(0 -3)² + b ⇒ 9a +b = 6

For (x, y) = (2, 22):

22 = a(2-3)² +b ⇒ a +b = 22

Subtracting the second equation from the first gives ...

(9a +b) -(a +b) = (6) -(22)

8a = -16 . . . . . . collect terms

a = -2 . . . . . . . . divide by 8

The second equation above tells us ...

b = 22 -a = 22 -(-2) = 24

So, our equation for y is ...

y = -2(x -3)² +24

The value of y for x=5 is ...

y = -2(5 -3)² +24 = 16

The height of the ball after 5 seconds is 16 feet.

5 0

2 years ago