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4 years ago

I need a lot of help

Mathematics

1 answer:

vova2212 [387]4 years ago

4 0

15. 1/2 base * hight , 1/2 * 11 * 6 = the answer is 33 cm^2

16. The "median" is the "middle" value in the list of numbers. To find the median, your numbers have to be listed in numerical order from smallest to largest, so you may have to rewrite your list before you can find the median. So the answer is 155.

17. The mean is the usual average, so I'll add and then divide. (33+25+42+25+31+37+46+29+38) / 9 = 34

18. You have to draw a plot.

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Which trinomial is a perfect square trinomial? a2 – 18a + 36 a2 – 16a + 64 a2 – 8a + 64 a2 – 6a + 36

Komok [63]

Answer:

$a^2-16a+64$

Step-by-step explanation:

we have the options

$a^2-18a+36\\a^2-16a+64\\a^2-8a+64\\a^2-6a+36$

the one that is a perfect equare tinomial is:

$a^2-16a+64$

because we can rewrite this as follows:

$(a-8)^2$ this is because we know that

$x^2-2xy+y^2=(x-y)^2$

thus

$a^2-16a+64=(x-8)^2$

and the other options cannot be represented as a perfect square trinomial, so the correct answer is:

$a^2-16a+64$

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3 years ago

Rationalize the denominator 11/Square root of 5 - square root of 6

olasank [31]

Answer:

$-11\sqrt{5}-11\sqrt{6}$

Step-by-step explanation:

The given radical expression is;

$\frac{11}{\sqrt{5}-\sqrt{6}}$

We multiply both the numerator and the denominator by the conjugate of

$\sqrt{5}-\sqrt{6}$ which is $\sqrt{5}+\sqrt{6}$

$\frac{11(\sqrt{5}+\sqrt{6})}{(\sqrt{5}-\sqrt{6})(\sqrt{5}+\sqrt{6})}$

The denominator is now difference of two squares;

$\frac{11(\sqrt{5}+\sqrt{6})}{(\sqrt{5})^2-(\sqrt{6})^2}$

Simplify:

$\frac{11(\sqrt{5}+\sqrt{6})}{5-6}$

$\frac{11(\sqrt{5}+\sqrt{6})}{-1}$

$-11(\sqrt{5}+\sqrt{6})$

$-11\sqrt{5}-11\sqrt{6}$

8 0

4 years ago

Solve the equation 23z=18

tatyana61 [14]

Answer:

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$23z = 18 \\ z = \frac{18}{23} \\ z = 0.782$

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3 years ago

Read 2 more answers

A cylindrical tank has a diameter of 10 and a height of 7 feet. If each cubic foot holds 7.48 gallons of water, how many gallons

sergey [27]

Answer:

The tank can hold 4110.26 gallons of water.

Step-by-step explanation:

In order to solve this question we need to compute the volume of this tank, the volume is given by:

V = (area of the base)*height

Since the base is circullar, it is given by:

area of the base = pi*r^2

So we have:

V = height*pi*r^2

The radius of circle is the diameter divided by 2, so in this case r = 10/2 = 5 ft. We can now use the values on the equations:

V = 7*3.14*(5)^2 = 549.5 ft^3

Since each cubic foot holds 7.48 gallons of water the volume in gallons is:

V = 549.5*7.48 = 4110.26 gallons

The tank can hold 4110.26 gallons of water.

7 0

4 years ago

Write the definition of Congruent Segments as a Biconditional Statement.

Anna35 [415]

Answer:

A bi conditional statement is a combination of a conditional statement and its converse written in the if and only if form. Two line segments are congruent if and only if they are of equal length

Step-by-step explanation:

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3 years ago