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3 years ago

Mar 10, 11:28:13 PM

Mathematics

2 answers:

Virty [35]3 years ago

5 0

Answer:

s249

Step-by-step explanation:

i dont have an explanation but yeah sorry

EleoNora [17]3 years ago

3 0

Answer:

$336

Step-by-step explanation:

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What is (3xy^2)(-6xy^4)

krok68 [10]

Answer:

$-18x^2y^6$

Step-by-step explanation:

we have

$(3xy^2)(-6xy^4)$

Applying property of exponents

$x^{m} x^{n}=x^{m+n}$

$(3xy^2)(-6xy^4)=(3)(-6)(x^{1+1})(y^{2+4})=(-18)(x^{2})(y^{6})=-18x^2y^6$

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4 years ago

There is one pair of congruent triangles in the figure. Identify the congruence using proper notation.

Kruka [31]

Answer: QRP ~= TSP
~= means congruent

6 0

3 years ago

The lengths of pregnancies are normally distributed with a mean of 266 days and a standard deviation of 15 days.

inessss [21]

The lengths of pregnancies are normally distributed with a mean of 266 days and a standard deviation of 15 days.

That is,

Consider X be the length of the pregnancy

Mean and standard deviation of the length of the pregnancy.

Mean $\mu =266\\$

Standard deviation \sigma =15

For part (a) , to find the probability of a pregnancy lasting 308 days or longer:

That is, to find $P(X\geq 308)$

Using normal distribution,

$z=\frac{X-\mu}{\sigma}$

$z=\frac{308-266}{15}$

$=\frac{42}{15}$

Thus $z=2.8$

So $P\left (X\geq 308 \right )=1-P(X$

$=1-P(z$

$=1-Table\: value\: of\: 2.8$

$=1-0.99744$

$=0.00256$

Thus the probability of a pregnancy lasting 308 days or longer is given by 0.00256.

This the answer for part(a): 0.00256

For part(b), to find the length that separates premature babies from those who are not premature.

Given that the length of pregnancy is in the lowest 3%.

The z-value for the lowest of 3% is -1.8808

Then $X=\frac{X-\mu}{\sigma}\Rightarrow X=z*\sigma+\mu$

This implies $X=-1.8808*15+266=237.788$

Thus the babies who are born on or before 238 days are considered to be premature.

5 0

3 years ago

If x =5 find the value of 2x squared

Bas_tet [7]

Answer:

100

Step-by-step explanation:

2(5)^2

10^2

100

4 0

3 years ago

For Triangle ABC, what is the length of AB?<br> A 3<br> B 4<br> C 5<br> D 6

Nata [24]

Answer:

its c

Step-by-step explanation:

4 0

3 years ago