All categories

2 years ago

Please help me please please

Mathematics

1 answer:

Ahat [919]2 years ago

8 0

35:105*100 =

(35*100):105 =

3500:105 = 33.33

You might be interested in

My math question to u 4 - 6x = 8

tester [92]

X=2 because it equals 12.

4 0

3 years ago

Read 2 more answers

Which expression equals -(9x + 8) - 2(x -5)

Troyanec [42]

-(9x + 8) - 2(x -5)
= -9x - 8 - 2x + 10
= -11x + 2

3 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

3 years ago

Find x. please help

d1i1m1o1n [39]

Answer: 29

Step-by-step explanation: 180-146= 34-5 29.

4 0

3 years ago

Read 2 more answers

#5 Test question 7th grade math

katen-ka-za [31]

Answer:

0.85p and p - 0.15p are right

8 0

3 years ago