3 years ago

Which number is rational?

Mathematics

1 answer:

salantis [7]3 years ago

8 0

The last one is rational because it is a terminating decimal.

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Students at a middle school are divided into 6th, 7th, and 8th grades. A random sample of 15 students from each grade is chosen.

Julli [10]

Answer:

B. Stratified random sample is the correct answer

4 0

2 years ago

Two trains 500 miles apart accidentally are on the same track heading toward each other. The passenger train is traveling 80 mph

Natalka [10]

Answer:

2 miles

Step-by-step explanation:

Their combined speed (speed of closure) is 80 mph + 40 mph = 120 mph.

120 mi/h = 120 mi/(60 min) = 2 mi/min

The distance between the trains at the 1-minute mark is ...

(1 min) · (2 mi/min) = 2 mi

They were warned when two miles apart.

3 0

3 years ago

Please help me answer this question.

Alex787 [66]

1. Change x = 4t into x = 3t

$4t\cdot\frac{3}{4}=3t$ so

$y=(\frac{3}{4}t)^2-1=\frac{9}{16}t^2-1$

Answer A and D are wrong.

2. Change x = 4t into x = 2t

$4t\cdot\frac{1}{2}=2t$ and

$y=(\frac{1}{2}t)^2-1=\frac{t^2}{4}-1$

Answer b is correct.

3. Change x = 4t into x = 8t

$4t\cdot2=8t$ and

$y=(2t)^2-1=4t^2-1$

Answer C. is correct, E. is wrong.

7 0

3 years ago

Plz tell me 12 x 12 = and 12 x 13 =

avanturin [10]

Answer:

12 x 12 = 144, 12 x 13 = 156

Step-by-step explanation:

3 0

3 years ago

If the equation of the regression line for the data set (3,4), (6,2), (9,18) is , what is the sse for the data set?

Licemer1 [7]

Answer:

38.9

Step-by-step explanation:

Lets say, first number = x

Second number = 3x+7

Total = 49

(x)+(3x+7)= 49

4x+7 = 49

4x = 42

x = 42/4

x= 10.5

3x+7 = 3(10.5)+7 = 38.9

Hope this helps!!

3 0

3 years ago