3 years ago

Multiply the polynomials 3(x+7) (show work pls)

Mathematics

1 answer:

Evgen [1.6K]3 years ago

8 0

Answer:

3x + 21

Step-by-step explanation:

(3)(x+7)

Now, we distribute the 3 in each term of (x+7)

So, 3*x = 3x and 3*7 = 21.

So our resulting term would be 3x+21.

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Evaluate x/y when x=32 and y=4.

lbvjy [14]

Answer:

x = 32

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2 years ago

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Find the sample size necessary to estimate the mean IQ score of statistics students such that it can be said with 99% confidenc

quester [9]

Answer: 18

Step-by-step explanation:

The formula to find the minimum sample size is given by :_

$n=(\dfrac{z^*\cdot \sigma}{E})^2$

, where $\sigma$ = population standard deviation.

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E= Margin of error.

Given : $\sigma= 13$

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We know that critical value corresponding to 99% confidence level = z*=2.576 [Using z-table]

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3 years ago

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3 years ago

Can any kind soul help me please

bezimeni [28]

Answer:

p-q= -4

p=q-4

x^2 + px + q=0

=> x^2 + (q-4)x + q = 0

d= b^2-4ac

=(q-4)^2 - 4(1)(q)

= q^2 + 16 -8q - 4q

=q^2 -12q+16

given that D=16

q^2 -12q+16 = 16

=> q^2 -12q = 0

=> q^2 = 12q

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=> q= 12

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