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lapo4ka [179]
3 years ago
15

Help with this math please

Mathematics
1 answer:
Nuetrik [128]3 years ago
6 0
Take a better picture, so we can actually see the work?
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Susan is writing a linear equation for the cost of her cell phone plan. In the first month, she talks for 52 minutes and is char
Alex787 [66]
Assuming that the cost per minute is the same for both months and the plan fee is the same, you can use y=mx+b for this

y is the cost of the phone plan, x is the cost per minute and b is the start cost.

so    19.41=25x+b for the first month
and  45.65=380x+b for the second month

solve both for b you get:
19.41-25x=b and 45.65-380x=b.  from this we get
19.41-25x=45.65-380x

solve for x

328x=26.24 and x=0.08

this means the cost per minute is 0.08c/min (answer A)

rewrite the equation to calculate b, and where this time, the x is the number of minutes talked.

y=0.08x+b and plug in one of the two months

45.65=0.08 * 380 + b

Solve for b and b is 15.25

so the final equation is

y=0.08x+15.25  (answer B)
5 0
3 years ago
A and b are positive integers and a–b = 3. Evaluate the following: 27^ (1/3 b)/9^ (1/2 a)
maxonik [38]

Answer:

1/27

Step-by-step explanation:

27^(b/3)/9^(a/2) = (27^(1/3))^b/(9^(1/2))^a = (3^b)/(3^a) = 3^(b-a)

= 3^(-(a-b)) = 3^-3 = 1/3^3 = 1/27

5 0
3 years ago
Another one <br><br> Question <br><br> b+11=4 <br> b=?
steposvetlana [31]

Answer:

b = -7     please mark brainliest :))))

Step-by-step explanation:

5 0
2 years ago
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Determine the solution you would get for 4=8
My name is Ann [436]

Answer:

C. no solution

Step-by-step explanation:

8 0
2 years ago
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What is the answer to -6+7x-6x=3
fgiga [73]
Hi!

-6+7x-6x = 3
-6+x = 3
x = 3+6
x = 9

Answer:

x = 9

3 0
3 years ago
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