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ki77a [65]
3 years ago
15

Deandre needs a total of $380 to buy a new bicycle. He has $35 saved. He earns $15 each week delivering newspapers. How many wee

ks will Deandre have to deliver papers to have enough money to buy the bicycle?
Mathematics
2 answers:
Alex17521 [72]3 years ago
5 0
Deandre will have to deliver papers for another 23 weeks
You get this answer by solving this equation: $380-$35/$15=23
And to make sure this is accurate u can just multiply $15 by 23 and you’ll get $345
But you have to be sure that you add the money that he already made!
Umnica [9.8K]3 years ago
4 0
If he need 380 to buy the bike but already has35, the he needs 380-35 = 345 more.  if he makes 15 a week delivering papers, divide 345 by 15 to get the number of weeks it will take to save.  345/15=23  23 weeks
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If x+y=10 and x-y =6 what is the answer of x cube - y cube fast​
AfilCa [17]

Answer:

x+y=10 which means that x=10-y

Replace 10-y in the other equation which gives you:

10-y-y=6

10-2y=6

-2y=-4

y=2

Replace 2 in any of the 2 equations same answer for both:

x+y=10

x+2=10

x=8

So,

{x}^{3} - y^{3}

=  {8}^{3}  -  {2}^{3}

=512-8

=504

Hope this helps!

4 0
2 years ago
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snow_tiger [21]
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5 0
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Answer:11

Step-by-step explanation:

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Brandon buys a radio for $44.97 in a state where the sales tax is 7%.
emmasim [6.3K]

Answer: If a magazine costs $2.35 and has a 6% sales tax, then what is the total cost of the item. First, we need to convert the sales tax percentage into a decimal

Step-by-step explanation:

8 0
3 years ago
For some transformation having kinetics that obey the Avrami equation (Equation 10.17), the parameter n is known to have a value
Nikolay [14]

Given Information:

constant = n = 1.7

transformation time 50% completion = t₅₀ = 100 s

Required Information:

transformation time 99% completion = t₉₀ = ?

Answer:

transformation time 99% completion = t_{90}  = 202.75 seconds

Step-by-step explanation:

The Avrami equation is used to model the transformation of solids that is from one phase to another provided that temperature is constant.

The equation is given by

y=1 - e^{{-kt}^{n}}

Where t is the transformation time in seconds and n, k are constants.

Let us first find the constant k, since after 100 s transformation is 50% complete,

0.50=1 - e^{{-k*100}^{1.7}}

0.50 - 1= - e^{{-k*100}^{1.7}}

-0.50= - e^{{-k*100}^{1.7}}

0.50 = e^{{-k*100}^{1.7}}

Take ln on both sides,

ln(0.50) = ln(e^{{-k*100}^{1.7}})

-0.693 = -k*100}^{1.7}

0.693 = k*100}^{1.7}

k = 0.693/100}^{1.7}

k = 2.759*10^{-4}

Now we can find out the time when the transformation is 99% complete.

0.90=1 - e^{{-kt}^{n}}

0.90 - 1= - e^{{-k*t}^{n}}

-0.10= - e^{{-kt}^{n}}

0.10 = e^{{-kt}^{n}}

Take ln on both sides,

ln(0.10) = ln(e^{{-k*t}^{n}})

-2.303 = -kt}^{n}

\frac{2.303}{k}  = t^{n}

\frac{2.303}{2.759*10^{-4} }  = t^{n}

Again take ln on both sides

ln(\frac{2.303}{2.759*10^{-4} })  =ln( t^{n})

9.03 = nln(t)

\frac{9.03}{n}  = ln(t)

\frac{9.03}{1.7}  = ln(t)

5.312 = ln(t)

Take exponential on both sides

e^{5.312} = e^{ln(t)}

202.75 = t

t = 202.75 seconds

8 0
3 years ago
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