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kirill115 [55]
3 years ago
11

_____ 20. Brandon needs $480 to buy a TV and stereo system for his room. He received $60 in cash for birthday presents. He plans

to save $30 per week from his part-time job. To find how many weeks w it will take to have $480, solve 60 + 30w = 480. Type your answer in the blank to the left. A. 16 weeks B. 13 weeks C. 15 weeks D. 14 weeks
Mathematics
2 answers:
Anit [1.1K]3 years ago
6 0
In order to solve the equation, we must simplify for w.
Original: 60 + 30w = 480

30w = 480 - 60
30w = 420
w = 420/30
w = 14

Therefore the correct answer is D. 14 weeks.
Hope this helps!
oee [108]3 years ago
6 0
The answer is D. weeks
 easy ways to check is by:
Birthday cash:$60
weekly saved: $30 
so 480- 60= 420 
and if you multiply 30 by 14 equal= 420 
Remember there are hundreds different ways to find the right answer for math
and i use this method cause i was running out of time to answer it. hope this 

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<h3>                f(10) = 37</h3>

Step-by-step explanation:

f(n) = 4n - 3

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Step-by-step explanation:

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3 years ago
What is the solution 5/2x - 7= 3/4 x + 14<br> A. x = -6<br> B. x = 6<br> C. x = 8<br> D. x =12
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3 years ago
Find an explicit solution of the given initial-value problem. (1 + x4) dy + x(1 + 4y2) dx = 0, y(1) = 0
MissTica

Answer:

a solution is 1/2 *tan⁻¹ (2*y) = - tan⁻¹ (x²) + π/4

Step-by-step explanation:

for the equation

(1 + x⁴) dy + x*(1 + 4y²) dx = 0

(1 + x⁴) dy  = - x*(1 + 4y²) dx

[1/(1 + 4y²)] dy = [-x/(1 + x⁴)] dx

∫[1/(1 + 4y²)] dy = ∫[-x/(1 + x⁴)] dx

now to solve each integral

I₁= ∫[1/(1 + 4y²)] dy = 1/2 *tan⁻¹ (2*y) + C₁

I₂=  ∫[-x/(1 + x⁴)] dx

for u= x² → du=x*dx

I₂=  ∫[-x/(1 + x⁴)] dx = -∫[1/(1 + u² )] du = - tan⁻¹ (u) +C₂ =  - tan⁻¹ (x²) +C₂

then

1/2 *tan⁻¹ (2*y) = - tan⁻¹ (x²) +C

for y(x=1) = 0

1/2 *tan⁻¹ (2*0) = - tan⁻¹ (1²) +C

since tan⁻¹ (1²) for π/4+ π*N and tan⁻¹ (0) for  π*N , we will choose for simplicity N=0 . hen an explicit solution would be

1/2 * 0 = - π/4 + C

C= π/4

therefore

1/2 *tan⁻¹ (2*y) = - tan⁻¹ (x²) + π/4

5 0
3 years ago
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