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2 years ago

15

Hector just bought a new laptop for $780. He earned the $780 by selling lemonade, mowing lawns, and

1 answer:

oksano4ka [1.4K]2 years ago

6 0

Answer:

Step-by-step explanation:

40% of 780 = 312.

780- (312+180)

= 288

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Two similar cones have volume of 4 m and 108 m respectively. If the large one has surface area 54 m, find the surface area of th

trasher [3.6K]

$\displaystyle\bf\\Explanations:\\\\The~similarity~ratio~of~two~similar~cones=k\\\\k=is~the~ratio~between~2~corresponding~lengths\\\\k=\frac{R_1}{R_2}=\frac{h_1}{h_2}\\\\The~ratio~between~2~corresponding~areas~of~similar~cones=k^2\\\\\frac{Area~1}{Area~2}=k^2\\\\The~ratio~between~the~volumes~of~the~2~similar~cones=k^3\\\\\frac{Volume~1}{Volume~2}=k^3$

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$\displaystyle\bf\\Solving:\\\\Volume1=108~m^3\\\\Volume2=4m^3\\\\k^3=\frac{108}{4}\\\\k^3=27~~\Big|\sqrt{~}\\\\k=\sqrt[\b3]{27}\\\\k=3\\\\Area1=54~m^2\\\\\frac{Area~1}{Area~2}=k^2\\\\\frac{54}{Area~2}=3^2\\\\\frac{54}{Area~2}=9\\\\Area2=\frac{54}{9}\\\\\boxed{\bf Area2=6 m^2}$

4 0

2 years ago

The equation y = kx represents a proportional relationship between x and y, where k is the constant of proportionality. For a mo

Natasha_Volkova [10]

Answer:

Step-by-step explanation:

for this equation

d=st

we can represent s as d/t

we can represent t as d/s

and in real world we have a lot of this type of equations

some of them are,

d=m/v ( density = mass / volume )

C = m.c ( heat capacity = mass x specific heat )

7 0

2 years ago

What is he value of 7 in 506,087

daser333 [38]

The value of 7 is 7 because it is in the ones place

7 0

3 years ago

Read 2 more answers

I need help please and thank you.

kogti [31]

Step-by-step explanation:

$\frac{2x}{5} + \frac{1}{3} = \frac{7x - 2}{15}$

$\frac{6x + 5}{15} = \frac{7x - 2}{15}$

$6x + 5 = 7x - 2$

$6x - 7x = - 2 - 5$

$- x = - 7$

$x = 7$

option (4)

6 0

3 years ago

A while back, either James borrowed $12 from his friend Rita or she borrowed $12 from him, but he can’t quite remember which. Ei

Vadim26 [7]

Answer:

42.8 + or - 12

Step-by-step explanation:

He's either gaining or losing $12 so you can write 42.8 plus or minus 12 as the equation

6 0

3 years ago