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3 years ago

What is the complete factorization of 2x2 − 11x − 21?

Mathematics

1 answer:

vlabodo [156]3 years ago

4 0

It is 2x(x-7)+3(x-7) = (2x+3)(x-7)

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Can u get the steps to solving -2(4)^2+4

svp [43]

(4)^2 must be done first.

That’ll give you 16. (4x4)

16 x -2= -32

-32+4= -28

8 0

3 years ago

Which of the following is the reciprocal parent function? (Please help ASAP)

ivolga24 [154]

Answer:

Step-by-step explanation:

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3 years ago

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Angela is buying a dress that is on sale for 20% off. if the original price of the dress is $30.00, how much money is angela sav

Musya8 [376]

You have to calculate percent from the original price. Try it and show the results.

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3 years ago

You measure 20 turtles' weights, and find they have a mean weight of 45 ounces. Assume the population standard deviation is 11.5

Naily [24]

Answer: the maximal margin of error associated with a 90% confidence interval for the true population mean turtle weight = 4.23

Step-by-step explanation:

Formula for margin of error : $E=\dfrac{z^*\times (Population\ standard\ deviation)}{\sqrt{Sample\ size}}$

, where z* = Critical z-value.

Given: population standard deviation = 11.5 ounces

Sample size = 20

Z value for 90% confidence level = 1.645

margin of error (E) = $\dfrac{1.645\times11.5}{\sqrt{20}}$

$\approx4.23$

Hence, the maximal margin of error associated with a 90% confidence interval for the true population mean turtle weight = 4.23

3 0

3 years ago

Denzel wants to work out the density of a block of wood the block of wood is in the shape of the cuboid

marishachu [46]

Answer:

$Density = 1.094g/cm^3$

Step-by-step explanation:

Given

$Length = 17.7cm$

$Width = 8.3cm$

$Height = 13.0cm$

$Mass = 2090g$

See attachment

Required

Determine the density of the wood

First, we calculate the volume of the wood.

$Volume = Length * Width * Height$

Substitute values for Length, Width and Height

$Volume = 17.7cm * 8.3cm * 13.0cm$

$Volume = 1909.83cm^3$

The density is:

$Density = \frac{Mass}{Volume}$

$Density = \frac{2090g}{1909.83cm^3}$

$Density = 1.094g/cm^3$ --- approximated

5 0

3 years ago