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aleksley [76]
3 years ago
13

Mr.Jackson is saving money to go on a trip. Last month,he saved $21 dolloars each week for 4 weeks. This month he saved 3 times

as much money as he saved last month. How much money did mr.Jackson save this month ?
Mathematics
1 answer:
Anit [1.1K]3 years ago
7 0

Answer:

The total amount he saved this month=84×3=$252

Step-by-step explanation:

Last month he saved 21 dollars each week for 4 weeks, to calculate the total amount he saved for the for weeks, we can express this as;

Total amount=Amount he saved per week×Number of weeks  

Where;

Amount he saved per week =$21

Number of weeks=4 weeks,

Replacing;

Total amount=21×4=$84

This month he saved 3 times as much money as he saved last month, this can be expressed as;

The total amount he saved this month=Amount saved last month×3

Where; Amount saved last month=$84

Replacing;

The total amount he saved this month=84×3=$252

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Does the parabola h(t) = -16t2 + 250t open up or down? Why does this make sense?
mash [69]
Down because it has a negative coefficient.
3 0
4 years ago
The cost of 300 metres optic fibre is $200 what will be the cost if 1 metre of optic fibre.
Elden [556K]

The answer is:  " $0.67 / metre " ;  
                        or, write as:  " [ \frac{2}{3} dollar] per metre."
____________________

<u>Step-by-step explanation</u>:

This is a unit rate problem:
   Find the cost in dollars per [single unit—in this case: "metre(s)", "<em>m</em>" ;
_________________
 \frac{200 dollars}{300m} = \frac{? dollars}{1m} ;  Solve for the "?" <u>amount of dollars</u>.
_________________
Method 1)  "Cross-factor multiply" :
<u>Note</u>:  <u>Given</u><u>:</u> " \frac{a}{b} = \frac{c}{d} ;  [b\neq 0;  d\neq 0] " ;

 then:   ⟷  " ad = bc " ;
_________________

So:  " \frac{200 dollars}{300m} = \frac{? dollars}{1m} " ;

  then:   ⟷  " (200*1) = (300* ?) ;

     → "  (200) = (300  * ?)" ;

     ↔ " (300 * ?) = 200 " ;  

Let "x" refer to the "?" ; the "<u>unknown value</u>" (<u>in dollars</u>);

                for which we are trying to solve.

⇒ " 300x = 200 " ;  Solve for "x" ;
     → Divide each side of the equation by: "300" ;

       to isolate "x" on the "left-hand side" of the equation; & to              solve  for "x" ;
   ⇒  300x/ 300 = 200/300 ;

    To get:  " x = \frac{2}{3} dollars" ;  

= $0.666666666... ;

round to: $0.67 .

{since: " 1 dollar = $1.00 = 100 cents" ;
and since: "\frac{2}{3} " ;

= ["2 ÷ 3" = 0.666666...." ] ;  

⇒  round to:  "0.67 " ;  

and write as:
__________

⇒  $0.67 / metre ;   or, write as:
    " [ \frac{2}{3} dollar] per metre."
_________

Method 2)  <u>Note</u>:
\frac{200 dollars}{300m} = \frac{? dollars}{1m} ;

⇔   = "  \frac{200}{300}  \frac{dollars}{metre} " ;
      {<u>Note</u>:  "[200÷300]" can be simplified by "canceling out" the two (2) zeros in both the numerator and the denominator.}.

   = " \frac{2 dollars}{3m} ";
_________

  =  i.e. " \frac{\frac{2}{3} dollars}{metre} " or;  \frac{0.67 dollars} {m} ;  or:  <u>$0.67 / metre</u> .

         ⇒  {since:  " \frac{2}{3} of 1 dollar" = " \frac{2}{3} dollars of 100 cents" ;
        ⇒  {since:  "1 dollar = 100 cents"} ;

           ⇒ {and: " \frac{2}{3} " = 0.6666666666666... " } ;  

 → round to:  "0.67 " ; and thus: $0.67 / metre.
_________
Note that using either of these 2 (two) methods result in the same answer.
               Hope this is helpful!  Best wishes to you within your academic pursuits!
             _________________

7 0
3 years ago
A married couple filing their federal income tax return jointly had a taxable
julia-pushkina [17]

Answer:

The income will they have left over after paying their federal income tax is <u>$64,850.00</u>.

Step-by-step explanation:

Given:

A married couple filing their federal income tax return jointly had a taxable

income of $76,300.

Now, to find according to the table the income will they left over after paying their federal income tax.

<em>So, as given in table:</em>

<em>The tax of the taxable income over $67,900 but not over $1,37,050 is $9,350 plus 25% of the amount over $67,900.</em>

As, the taxable income $76,300 falls in to the above conditions.

Now, to calculate the tax:

9350+25\%\ of\(76300-67900)

=9350+25\%\ of\ 8400

=9350+\frac{25}{100} \times 8400

=9350+0.25\times 8400

=9350+2100

=11450.

<em>Thus, the tax = $11450.</em>

Now, deducting the tax from the taxable income:

76300-11450\\=64850

<em>So, the amount left = $64,850</em>.

Therefore, the income will they have left over after paying their federal income tax is $64,850.00.

6 0
3 years ago
hot dogs come in packs of 10 , while buns come in packs of eight . what are the least numbers of packs you should buy in order t
Blababa [14]
This question is basically asking for the least common multiple which in this case is 40 because 10x4 is 40 and 8x5 is also 40.
4 0
4 years ago
? Don't Send links, don't Write random things and get the points for free.
alekssr [168]

Answer:

V = 1847.26\ ft^3

Step-by-step explanation:

Step 1:  Determine the volume

V=\pi r^2h

V = \pi *(7\ ft)^2 * (12\ ft)

V = \pi *49\ ft^2 * 12\ ft

V = \pi  * 588\ ft^3

V = 1847.26\ ft^3

Answer:   V = 1847.26\ ft^3

6 0
2 years ago
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