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Lorico [155]
3 years ago
15

Is 487 closer to 480 or to 490

Mathematics
2 answers:
nadya68 [22]3 years ago
8 0

Answer:

Its is Closer to 490

Step-by-step explanation:

If the number that is in the ones place

Is smaller than 5 then it will go down

If the number is more than 5 then it will go up

Does that help

jek_recluse [69]3 years ago
6 0

Answer:

490

Step-by-step explanation:

because the 7 (last digit) is not less than 5, it rounds up to 490

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Find the value of the expression (-101)+102+(-103)+104+...+(-199)+200. (with steps)
Juliette [100K]
 hello : 
<span>(-101)+102+(-103)+104+...+(-199)+200
=(  </span>(-101)+(-103) +....+ (-199) ) +( (102) + ( 104) +....+(200))
let : A = (  (-101)+(-103) +....+ (-199) )
       B = ( (102) + ( 104) +....+(200))
note : the sum n term of arithemtic sequence 
S= n/2(u1 + un)
 un = u1 +(n-1) d       u1 : the first term      d : the common diference
in A :  u1= -101      d = -2       n = 49... 
in B : u1 =102       d=2        n= 49
A = 49/2(-101-199) =-7350
B=49/2(102+200)=4949
(-101)+102+(-103)+104+...+(-199)+200 = A+B =-2401
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3 years ago
The volleyball team at West View High School is comparing T-shirt companies where they can purchase their practice shirts. The t
mina [271]
10.5x = 7.5x + 30
10.5x - 7.5x = 30
3x = 30
x = 30/3
x = 10

10.5(10) = 105
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they need to purchase 10 t-shirts from each company for a total of $105 for each company
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112.324 nearest hundredth
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Answer: 112.32

Step-by-step explanation:

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. A firm produces a commodity and receives $100 for each unit sold. The cost of producing and selling x units is 20x + 0.25x 2 d
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a)
now, what's the highest profit they can make?  check the picture below.

\bf p(x)=-0.25x^2+80x\\\\&#10;-------------------------------\\\\&#10;\textit{ vertex of a vertical parabola, using coefficients}\\\\&#10;\begin{array}{lcclll}&#10;p(x) = &{{ -0.25}}x^2&{{ +80}}x&{{ +0}}\\&#10;&\uparrow &\uparrow &\uparrow \\&#10;&a&b&c&#10;\end{array}\qquad &#10;\left(-\cfrac{{{ b}}}{2{{ a}}}\quad ,\quad  {{ c}}-\cfrac{{{ b}}^2}{4{{ a}}}\right)&#10;\\\\\\&#10;\left( -\cfrac{80}{-0.50}~,~0-\cfrac{80^2}{-1} \right)\implies \left( \stackrel{\textit{quantity}}{160}~,~\stackrel{\textit{profit value}}{6400}  \right)

b)

well, if a tax is imposed on them, and say, they take it out of the revenue, then their new revenue is not 100x, is 90x, thus   \bf p(x)=-0.25x^2+70x

and you can use the same formula as above to get the x-coordinate for that vertex.

\bf p(x)=-0.25x^2+70x\\\\&#10;-------------------------------\\\\&#10;\textit{ vertex of a vertical parabola, using coefficients}\\\\&#10;\begin{array}{lcclll}&#10;p(x) = &{{ -0.25}}x^2&{{ +70}}x&{{ +0}}\\&#10;&\uparrow &\uparrow &\uparrow \\&#10;&a&b&c&#10;\end{array}\qquad &#10;\left(-\cfrac{{{ b}}}{2{{ a}}}\quad ,\quad  {{ c}}-\cfrac{{{ b}}^2}{4{{ a}}}\right)&#10;\\\\\\&#10;\left( -\cfrac{70}{-0.50}~,~0-\cfrac{70^2}{-1} \right)

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3 years ago
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mixas84 [53]

Answer:

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8 0
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