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3 years ago

I did not get the right answer, please help.

Mathematics

1 answer:

yawa3891 [41]3 years ago

6 0

Answer:frfr it made hard

Step-by-step explanation:

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Solve: 90 is greater than or equal to -9(w+3)

charle [14.2K]

I just solved this

another way
distributive propery
a(b+c)=ab+ac

90>-9(w+3)
distribute -9
-9(w+3)=-9w-27
now we have

90>-9w-27
add 27 to both sides
90+27>-9w+27-27
117>-9w
divide both sides by -9 and don't forget to flip relation symbol
-13<w
w>-13

any number from -13 and up is ossible

8 0

3 years ago

Find the surface area of the cone radius 8 height 7 . Use 3.14 for pi. Explain everything.

Blizzard [7]

Answer:

467.99 units²

Step-by-step explanation:

The formula for finding the surface area of a cone is:

$A=\pi r(r+\sqrt{h^{2}+r^{2}})$

Our values are:

r = 8

h = 7

π = 3.14

Let's plug the values into the formula

$A=\pi 8(8+\sqrt{7^{2}+8^{2}})$

$A=\pi 8(8+\sqrt{49+64})$

$A=\pi 8(8+\sqrt{113})$

$A=\pi 8(8+10.63)$

$A=\pi 8(18.63)$

$A= (3.14)(8)(18.63)$

$A= (25.12)(18.63)$

$A= 467.99$ units²

6 0

3 years ago

If triangle abc is similar to triangle def with ab=9, bc=11, and ac=16, then which of the following is closest to the ratio of d

aleksandr82 [10.1K]

Answer:

$\frac{de}{df}=\frac{9}{16}$ or $\frac{de}{df}=0.5625$

Step-by-step explanation:

we know that

If two figures are similar, then the ratio of its corresponding sides is proportional

In this problem

Triangle abc is similar to Triangle def

therefore

$\frac{de}{df}=\frac{ab}{ac}$

substitute the given values

$\frac{de}{df}=\frac{9}{16}$

7 0

3 years ago

Write a rule for the nth term of the arithmetic sequence 3, 11, 19, 27, 35... what is a20?

vladimir1956 [14]

3, 11, 19, 27, 35...

a = 3
d = 11-3 = 8
a20 = a + 19d = 3 + 19*8 = 3 + 132 = 135

HOPE IT HELPS!

5 0

3 years ago

I really need help with this pleaseeee

Sedaia [141]

Answer:

σ = 11.68

Step-by-step explanation:

$σ = \sqrt{ \frac{Σ{(xi - μ)}^{2} }{N} } \\ where \: σ = population \: standard \: deviation \\ xi = each \: value \: from \: population \\ μ = population \: mean \\ N = size \: of \: population$

$σ = \sqrt{ \frac{Σ{(9 - 26)}^{2} + {(16 - 26)}^{2} +{(30 - 26)}^{2} +{(35 - 26)}^{2} + {(40 - 26)}^{2}}{5} } \\ σ = \sqrt{ \frac{Σ{((-17)}^{2} + {(- 10) }^{2} +{(4) }^{2} +{(9) }^{2} +{(14) }^{2})}{5}} \\ σ = \sqrt{ \frac{Σ ({289} + {100} +{16} +{81} + {196})}{5} } \\ σ = \sqrt{ \frac{682}{5} } \\ σ = \sqrt{136.4} \\ σ = 11.679041056525\\ σ = 11.68$

4 0

3 years ago

I did not get the right answer, please help.​

I did not get the right answer, please help.