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Vlad [161]
3 years ago
9

Can someone help me i'm really lost

Mathematics
2 answers:
aniked [119]3 years ago
8 0
1,100m=850m+2000

First, subtract 850m from both sides.

1,100-850=250

250m=2000

Divide each side by 250

m=8

It will be 8 months when they paid the same amount.

1100(8)=8,800

Shaun paid 8,800 dollars

850(8)=6,800
6800+2000=8,800
Taliyah paid 8,800 dollars

8,800+8,800=17,600

They spent 17,600 together.

A) 8 months
B) 17,600 dollars
rusak2 [61]3 years ago
4 0
Its asking how much did they both spent, in total, in order to reach the same amount spent in part A
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Step-by-step explanation:

x+13÷2×2=4×2

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x+13-13=8-13

x=8-13

x=-5

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Answer:

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Help me please I don’t know how to do it
JulijaS [17]

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Step-by-step explanation:

4 0
3 years ago
A manufacturer wants to make open tin boxes from pieces of tin with dimensions 8 in. by 15 in. by cutting equal squares from the
Stells [14]

Answer:

\frac{5}{3} in

Step-by-step explanation:

Let x be the side of square.

Length of box=8-2x

Width of box=15-2x

Height of box=x

Volume of box=L\times B\times H

Substitute the values then we get

Volume of box=V(x)=(8-2x)(15-2x)x=(15x-2x^2)(8-2x)

V(x)=120x-30x^2-16x^2+4x^3

V(x)=4x^3-46x^2+120x

Differentiate w.r.t x

V'(x)=12x^2-92x+120

V'(x)=0

12x^2-92x+120=0

3x^2-23x+30=0

3x^2-18x-5x+30=0

3x(x-6)-5(x-6)=0

(x-6)(3x-5)=0

x-6=0\implies x=6

3x-5=0\implies x=\frac{5}{3}

Again differentiate w.r.t x

V''(x)=24x-92

Substitute x=6

V''(6)=24(6)-92=52>0

Substitute x=5/3

V''(5/3)=24(5/3)-92=-52

Hence, the volume is maximum at x=\frac{5}{3}

Therefore, the side of the square ,x=\frac{5}{3} in cutout that gives the box the largest possible volume.

5 0
2 years ago
New type of pump can drain a certain pool in 5 hours. an older pump can drain the pool in 15 hours. how long will it take both p
Leno4ka [110]
New pump:
5 hours = 1 pool
1 hour = 1/5 pool

Old pump:
15h = 1 pool
1h = 1/15 pool

If both work together
1h = 1/5 + 1/15 = 4/15 pool

4/15 pool = 1 hour
1/15 pool = 1/4 hour
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1 pool = 3.75 hours or 3 hours 45 mins
6 0
3 years ago
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