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Natali5045456 [20]
3 years ago
13

I need help on doing this

Mathematics
2 answers:
Rudik [331]3 years ago
7 0

Answer:

#5A=6

5B=4

Step-by-step explanation:

Helga [31]3 years ago
3 0

Answer:

5a) x=40   using the formulae for perimeter of a rectangle p=2(l+b)

120=2(l+20) factor out and you have 120=2l+40   make L subject of formulae then you have 2L=120-40   so L=80/2    L=40cm.

(5b) use the same procedure p=2(l+b)   then L=250m.

6a) since both area and perimeter are give then using p=2(l+b),  20=2(L+B)  so (L+b)=20/2    therefore (L+b)=10  

Now introduce the formular for area which is A=L*B   24=L*B     then making L sub of formular L=24/B    substitute into (L+B)=10  then u have 24/B +B =10 find LCM  you then have 24+B^2=10B   this becomes a quadratic equation  B^2 -10B +24 =0 solve and  you have B=4 or 6.   Substitute into (L+B)=10 to find L.  L= 4 or 6

6b) use the same procedure as 6a.

L=2 or 12 and W =12 or 2

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FIND VALUEE OF Y !!!
Mazyrski [523]

Answer:

7.

Step-by-step explanation:

9y+12=75

subtract 12 from 75

divide by 9y

5 0
3 years ago
Ada, Betty, Chris and David have $45 in total Ada gota 52 fromBetty, Chris tripleshis money and Davids money is cut by hall four
andrezito [222]

Using a system of equations, it is found that initially Ada has $0.385.

For the system, we have that the variables are:

  • x is Ada's amount.
  • y is Betty's amount.
  • z is Chris's amount.
  • w is David's amount.

$45 total, hence:

x + y + z + w = 45

Ada <u>gets 2 from Betty</u>, hence:

x + 2 = y - 2

x = y - 4

y = x + 4

<u>Chris triples</u> his money and <u>David's</u> money is <u>cut by half</u> four of them have the same amount, hence:

x + 4 = y = 3z = \frac{w}{2}

Then:

3z = x + 4

z = \frac{x + 4}{3}

x + 4 = \frac{w}{2}

w = 2x + 8

Solving for w, we find Ada's initial amount.

x + y + z + w = 45

x + x + 4 + \frac{x + 4}{3} + 2x + 8 = 45

4x + 12 + \frac{x + 4}{3} = 45

12x + 36 + x + 4 = 45

13x = 5

x = \frac{5}{13}

x = 0.385

Initially, Ada has $0.385.

A similar problem is given at brainly.com/question/6120515

5 0
3 years ago
81538 ÷ 42 = _______ ( Round to four decimal places as needed) ASAP​
AfilCa [17]

Answer:

1,941.381

Step-by-step explanation: Original answer is 1,941.38095

By rounding to the fourth decimal place = 1,941.381

4 0
3 years ago
If y = 2x - 8 what is the minimum value of the product xy
Alja [10]

Answer:

the minimum value of product  is -8

Step-by-step explanation:

We have been given the function y = 2x-8 and we have to find the minimum value of the xy.

Plugging the value of y in the product

f(x)=x(2x-8)\\\\f(x)=2x^2-8x

f(x) represents a upward parabola and we know that for a upward parabola, the minimum point is the vertex.

So in order to find the minimum value we find the y coordinate of the vertex of the parabola.

x-coordinate of the parabola is given by

-\frac{b}{2a}\\\\=-\frac{-8}{2\cdot2}\\\\=2

y -coordinate of the parabola is

y=f(2)=2(2)^2-8(2)\\\\=8-16=-8

Hence, the vertex is (2,-8)

Therefore, the minimum value of product  is -8

6 0
3 years ago
Read 2 more answers
Which equation represents the line passing through the points (3,2) and (-9,6)?
brilliants [131]
The equation is y= -1/3 x + 3
8 0
3 years ago
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