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Lubov Fominskaja [6]
3 years ago
15

simplify the polynomial then finds its value for the given value of the variable 3x^3-x^3+5x^3-9x^3 if x=-1

Mathematics
1 answer:
melisa1 [442]3 years ago
5 0

Answer: 2

Step-by-step explanation:

3•(-1)^3 - (-1)^3 + 5•(-1)^3 - 9•(-1)^3

3•(-1) - (-1) + 5•(-1) - 9•(-1)

-3 +1 -5 +9= 2

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Please help me answer this! thank you!​
ivolga24 [154]

Answer:

84 units²

Step-by-step explanation:

Triangles DPA and DMU are similar

DP/DM = PA/MU

3.75/10 = 4.5/MU

MU = 4.5×10/3.75

MU = 12

Area = ½ × (4+10) × 12

½ × 14 × 12

84 units²

7 0
3 years ago
Rayyan runs an average distance of 650 m each day. Find the total distance he runs in 7 days. Give your answer in Km.
andre [41]
The answer would be 4.55 Km
Do 650*7=4,550
Then do 4,550/1,000=4.55
Hope this helps!
6 0
3 years ago
Prove the identity: cos(3x) + cos(x) = 2cos(2x)cos(x)
Jet001 [13]
cos \alpha +cos \beta =2\cdot cos \frac{ \alpha + \beta }{2} \cdot cos \frac{ \alpha - \beta }{2}\\-----------------\\\\ \alpha =3x\ \ \ and\ \ \  \beta =x\\\\

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7 0
4 years ago
How to slove this one?
disa [49]

Answer:

turning it I think.........

3 0
3 years ago
What is y if x = 4 for the function y = 3x + 9?
Evgen [1.6K]
<h3>To find:-</h3>

Value of y

<h3>Given:-</h3>

x= 4

<h3>Solution :-</h3>

⟹ y = 3x + 9

⟹ y = 3 × 4 + 9

⟹ y = 12 + 9

<h3>⟹ y = 21</h3>
4 0
3 years ago
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