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Musya8 [376]
3 years ago
14

What are the solutions of the equation 9x^4 - 2x^2 - 7 = 0? Use u substitution to solve.

Mathematics
1 answer:
Eddi Din [679]3 years ago
3 0
The answers are C and D

i 7/3, -i 7/3.
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I need help! Thanks!
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Its a , i had it yesterday and i got everything right dont worry :))
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3 years ago
Read 2 more answers
1. The sum of the three consecutive members of the geometric sequence is 13. The proportion of the third and the first member is
aev [14]
If a = first term and r = common ratio we have

a + ar + ar^2 = 13   and ar^2 / a = r^2 = 9

so r = 3

and a + 3a + 9a = 13 
so a = 1

so they are  1,3 and 9 

2.
in geometric series we have

4 , 4r ,4r^2 , 60

Arithmetic;
 4,  4r , 4r + d ,  4r + 2d

so we have the system of equations
4r + 2d = 60
4r^2 = 4r + d
From first equation
2r + d = 30 
so d = 30 - 2r 
Substitute for d in second equation:-
4r^2 - 4r - (30-2r) = 0
4r^2 - 2r - 30 =0

2r^2 - r - 15 = 0
(r - 3)(2r + 5) = 0
r  = 3 or -2.5
r must be positive so its = 3
and d = 30 - 2(3) = 24

and the numbers are 4*3 =  12 , 4*3^2 = 36

first 3  are  4 , 12 and 36  ( in geometric)
and last 3 are 12, 36 and 60  ( in arithmetic)

The 2 numbers we ause are 12 and 36.





7 0
3 years ago
an elephant at the zoo lost 24 pounds over 6 months. The elephant lost the same amount of weight each month. Write an integer th
Viefleur [7K]


The elephant lost 4 pounds each month. Because he is losing weight, and not gaining weight, you have to make the answer negative
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3 years ago
Determine whether the two triangles are similar and, if they are similar, state a reason.
aleksley [76]

Answer:

Step-by-step explanation:

By triangle sum theorem,

Sum of interior angles of a triangle is 180°.

Therefore, measure of third angle in the larger triangle = 180° - (35° + 120°) = 25°

Similarly, measure of third angle in the smaller triangle = 180° - (25° + 120°)

= 35°

Since, measure of interior angles of larger triangle is equal to the measure of smaller triangle,

Both the triangles will be similar by AA property of similarity.

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Nine months ago Alexa deposited $5,882 in a three-year CD. She has received $229 in
vesna_86 [32]

Answer:

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2 years ago
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