3 years ago

Help me please ........

1 answer:

8 0

Answer:

Step-by-step explanation:

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mart [117]

She ran the last 100 meters in 2:15 -1:25 = 0:50, so her average speed was

... (100 m)/(50 s) = 2.0 m/s

6 0

3 years ago

deff fn [24]

Just do 1/8 times 1/8. Hope this helped !!

8 0

3 years ago

vichka [17]

Answer:

(25.732,30.868)

Step-by-step explanation:

Given that in a random sample of 42 people, the mean body mass index (BMI) was 28.3 and the standard deviation was 6.09.

Since only sample std deviation is known we can use only t distribution

Std error = $\frac{s}{\sqrt{n} } =\frac{6.09}{\sqrt{42} } \\=0.9397$

$df = 42-1 =41$

t critical for 99% two tailed $= 2.733$

Margin of error $= 2.733*0.9397=2.568$

Confidence interval lower bound = $28.3-2.568=25.732$

Upper bound = $28.3+2.568=30.868$

3 0

3 years ago

stiv31 [10]

Answer:

X= -11/4 + -1/4 √145 or X= -11/4 + 1/4 √145

Step-by-step explanation:

Hope this helped<3

4 0

3 years ago

Ilya [14]

$35=-2x-15\\2x=-15-35\\2x=-50\\x=-25$

3 0

3 years ago