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Darina [25.2K]
3 years ago
9

Solving radical/rational equations. -8+√5x=-3​

Mathematics
1 answer:
jek_recluse [69]3 years ago
4 0

Answer:

x = 5

Step-by-step explanation:

-8 + sqrt(5x) = - 3

Inverse operations

-8 + sqrt(5x) = - 3

+8                    +8

sqrt(5x) = 5

^2            ^2

5x = 25

/5      /5

x = 5

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8 0
3 years ago
What is the y-intercept of the line given by the equation y=5x-21
Bess [88]

Answer: C.( 0,-21)

Step-by-step explanation: Use the slope-intercept form to find the slope and y-intercept.

3 0
3 years ago
List all subsets of ta, b, c, d, e) containing a but not containing b
fomenos

Answer:

(a), (a,c), (a,d), (a,e), (a,c,d), (a,c,e), (a,d,e), (a,c,d,e)

Step-by-step explanation:

We are given the set (a,b,c,d,e).

Total number of subsets of the above set are 2^5 = 32

Subsets:

φ

(a,b,c,d,e)

(a), (b), (c), (d), (e)

(a,b), (a,c), (a,d), (a,e), (b,c), (b,d), (b,e), (c,d), (c,e), (d,e)

(a,b,c), (a,b,d), (a,b,e), (a,c,d), (a,c,e), (a,d,e), ( b,c,d), (b,c,e), (b,d,e), (c,d,e)

(a,b,c,d), (a,b,c,e), (a,b,d,e), (a,c,d,e), (b,c,d,e)

Subset having a but not b :

(a), (a,c), (a,d), (a,e), (a,c,d), (a,c,e), (a,d,e), (a,c,d,e)

7 0
3 years ago
Select the angle that correctly completes the law of cosines for this triangle. 72 + 252 – 2(7)(25)cos ___ = 242 A. 180° B. 90°
meriva

Answer:

x =76.45 degrees

Step-by-step explanation:

72 + 252 – 2(7)(25)cos _x__=242

combine like terms

324-350cosx = 242

subtract 324 from each side

-350x = -82

divide by -350

cos x = -82/-350

cos x = 82/350

take the arccos of each side

arccos (cos x) = arccos (82/350)

x =76.45 degrees


7 0
3 years ago
Solve 7k÷3=21<br><br><br> The solution is k __
qaws [65]
First, multiply by 3 on both sides:
7k = 63

Divide by 7:
k = 9

So, k = 9
4 0
3 years ago
Read 2 more answers
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