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3 years ago

Help and explain please and thankyou

Mathematics

1 answer:

WINSTONCH [101]3 years ago

4 0

Answer:

Step-by-step explanation:

the inverse of f(x) = (x + 2 )÷3 is

f (x) -¹ = 3x - 2

f(4)-¹ = 3(4) - 2

= 10

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4.) Order the following decimals from greatest to least. 15.9 9.5 1.95 9.15 1.59

olya-2409 [2.1K]

1.59, 1.95, 9.15, 9.5, 15.9

3 0

3 years ago

The data list shows the scores of ten students in Mr. Smith's math class. 61, 67, 81, 83, 87, 88, 89, 90, 98, 100 What is the st

anzhelika [568]

Sample standard deviation

Mean of data = 84.4

Calculate deviations from the mean = 23.4, 17.8, 3.4, 1.4, -2.6, -3.6, -4.6, -5.6, -13.6 and -15.6

Squaring these deviations; we get 547.56, 316.84, 11.56, 1.96, 6.76, 12.96, 21.15, 31.36, 184.96, 243.36

Adding these we get 1378.47

As its a sample Std Dev we divide by 10 - 1 = 9. For the popklation Std Dev we divide by the number of scores (10).

Std Deviation for sample = sqrt ( 1378.47 / 9) = 12.4 to nearest tenth (answer)

Population Std Dev = sqrt (1378.47 / 10) = 11.7 answer

Theres a lot of arithmetic there so hope i haven't slipped up anywhere!

6 0

3 years ago

The sum of 2 consecutive odd integers is 92. Find the numbers.

padilas [110]

Answer:

45, 47

Step-by-step explanation:

Their average, 92/2 = 46, is the even integer between them. The two integers of interest are 45 and 47.

___

Any consecutive integers of the same parity (odd or even) differ by 2. If x is the smaller, then x+2 is the larger.

We suppose you're supposed to write the equation ...

x + (x+2) = 92

2x = 90 . . . . . . subtract 2

x = 45 . . . . . . . .the smaller integer is 45; the larger one is x+2 = 47.

6 0

3 years ago

Read 2 more answers

Which is the graph of the linear inequality x – 2y > –6?

Zina [86]

Answer:

On a coordinate plane, a dashed straight line has a positive slope and goes through (negative 4, 2) and (4, 4). Everything below and to the right of the line is shaded.

Step-by-step explanation:

The first step is writing in the general form of the first order equation

y = f(x) or y > f(x) or y < f(x)

And

f(x) = ax + b

In which a is the slope.

We have that:

x - 2y > -6

-2y > -6 - x

When multiplying by -1, the signal changes, from > to <

2y < x + 6

y < 0.5x + 3

The slope is positive, since 0.5 is positive.

Since it is y lesser than, it is everything below and to the right of f(x) is painted.

The line is dashed because this is just lesser, not lesser or equal.

The correct answer is:

On a coordinate plane, a dashed straight line has a positive slope and goes through (negative 4, 2) and (4, 4). Everything below and to the right of the line is shaded.

8 0

3 years ago

Read 2 more answers

-m + 5n = -2, for n

MakcuM [25]

Answer:

Step-by-step explanation:

-m + 5n = -2, for n

-m + 5n = -2

-m +5n + m = -2 + m

5n = m - 2

5n/5 = (m-2)/5

n = 1/5m + (-2)/5

6 0

2 years ago