Solve. -3.5 x 0.2= 1. -7.0 2. -0.7 3. 0.7 4. -3.3

Today, the price of a new cellphone is $380. In 2010, the price of a similar cellphone was $240. What is the percent of change i

Dahasolnce [82]

36.8% or 37% is the percent change

8 0

3 years ago

You bought a new car in 2015 for $32,000 that is depreciating in value by 15% each year. Write a function to represent this situ

Hitman42 [59]

Function: x = years

x = $32,000-15%x

Value of car in 2020:

$8000

4 0

3 years ago

X = 16 is a solution for the equation 17 + x = 33 true or false

lilavasa [31]

$\begin{gathered} 17+x=33 \\ 17+x-17=33-17 \\ x=16 \end{gathered}$

its true

4 0

1 year ago

How do I solve this system of equations by substitution? y - 3x = 2, y=(x + 1)^2 - 5

Arada [10]

Hello,

y-3x=2==>x=(y-2)/3
==>(x+1)²=((y-2)/3+1)²=(y+1)²/9

y=(x+1)²-5
==>y=(y²+2y1)/9 -5
==>y²-7y-44=0 ; Δ=7²+4*44=225=15²
==>y=(7+15)/2 or y=(7-15)/2

==>y =11 and x=(11-2)/3=3
or y=-4 and x=(-4-2)/3=-2

sol={(3,11);(-2,-4)}

5 0

3 years ago

The ratio of the diameters is 15:11. If the diameter of the smaller ball is 55cm, what is the volume of the larger ball? Round t

gizmo_the_mogwai [7]

Answer:

220,781.25 cubic cm

Step-by-step explanation:

Given ratio of the diameters = 15:11

Let the actual value of of diameters be 15x and 11x to maintain the ratio of 15:11

Given that smaller one has diameter of 55cm

thus 11x = 55cm

x = 55/11 cm = 5

Thus, diameter of larger ball = 15xcm= 15*5cm =75cm.

we know that radius is half of diameter

Radius = diameter/2

Thus radius of larger ball = 75/2 cm = 37.5 cm.

Volume of sphere is given by $(4/3)\pi r^3$

we know that ball has spherical shape

thus volume of larger ball is calculated as given below

$volume \ of \ ball = (4/3)\pi r^3\\=> volume \ of \ ball = (4/3)*3.14* 37.5^3\\=> volume \ of \ ball = (4/3)*3.14* 37.5^3\\=> volume \ of \ ball = 220,781.25$

Thus, volume of larger ball is 220,781.25 cubic cm

5 0

3 years ago