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3 years ago

What is the reciprocal of 5/4

Mathematics

1 answer:

snow_lady [41]3 years ago

4 0

Answer:

your answer should be 4/5

Step-by-step explanation:

hope this helps

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Number 1 and number 2 pleasseee

lina2011 [118]

Answer:

(a) 19 44

(b) 3.96 m

2.01 x 90%= 1.95

1.95 + 2.01

(c)

i] 6

2 events *3 medals per event

ii] 60

simple ratio

iii] 20 including marathon run and high jump events

(a) 8.5 cm

closest round off figure

(b) 4/3πr²

4/3 x π x (8.5)²

303 cm³

4 0

3 years ago

I'll give brainliest to person who answers first once I'm able to.

skelet666 [1.2K]

Answer:

i think it's 3?

Step-by-step explanation:

8 0

3 years ago

Read 2 more answers

Rainwater was collected in water collectors at thirty different sites near an industrial basin and the amount of acidity (pH lev

stiv31 [10]

Answer:

The mean and standard deviation of the corrected pH measurements are 6.63 and 3.8025 respectively.

Step-by-step explanation:

We can correct the values of the mean and standard deviation using the properties of the mean and the variance.

To the original value X we have to add 0.2 and multiply then by 1.3 to calculate the new and corrected value Y:

$Y=1.3(X+0.2)$

The mean and standard deviation of the original value X are 4.9 and 1.5 respectively.

Then, we can apply the properties of the mean as:

$E(Y)=E(1.3(X+0.2))=1.3E(X+0.2)=1.3E(X)+1.3*0.2\\\\E(Y)=1.3E(X)+0.26\\\\E(Y)=1.3*4.9+0.26=6.37+0.26=6.63$

For the standard deviation, we apply the properties of variance:

$V(Y)=V(1.3(X+0.2))\\\\V(Y)=1.3^2\cdot V(X+0.2)\\\\V(Y)=1.69\cdot V(X)\\\\V(Y)=1.69\cdot 1.5^2=1.69\cdot 2.25=3.8025$

The properties that have been applied are:

$1.\,E(aX)=aE(X)\\\\ 2.\,E(X+b)=E(X)+b\\\\3.\,V(aX)=a^2V(X)\\\\4.\,V(X+b)=V(X)+0$

3 0

4 years ago

Simplify <img src="https://tex.z-dn.net/?f=%5Cfrac%7B8%28x%2B3%29%5E%7B2%7D%7D%7B2%28x%2B3%29%7D" id="TexFormula1" title="\frac{

zaharov [31]

The answer simplified is -148

4 0

4 years ago

Can someone help me?

hoa [83]

Answer:

Step-by-step explanation:

If arccos (√3 / 2) = β, then cos β = adjacent side / hypotenuse = √3 / 2. This tells us immediately that the adjacent side length is √3 and the hypotenuse is 2. Via the Pythagorean Theorem, we know that the third side is 1.

This information rules out the 1st and 3rd answer choices.

Because cos 30° = adj / hyp = √3 / 2, we can conclude that the correct answer is the 4th one: 30°, 60°, 90°

5 0

3 years ago