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4 years ago

Explain how you can use doubles when multiplying with 4 to find 4x8

Mathematics

1 answer:

STALIN [3.7K]4 years ago

8 0

You can figure out what four times eight is by adding eight and eight(16) and doubling it (32)

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Write an algebraic expression for each verbal description.

BaLLatris [955]

Step-by-step explanation:

3r + (9 + 2r + 1)

this can be simplified :

3r + (9 + 2r + 1) = 3r + 2r + 9 + 1 = 5r + 10

7 0

2 years ago

Let y′′′−9y′′+20y′=0. find all values of r such that y=erx satisfies the differential equation. if there is more than one correc

DerKrebs [107]

we are given

differential equation as

$y'''-9y''+20y'=0$

we are given

$y=e^{rx}$

Firstly, we will find y' , y'' and y'''

those are first , second and third derivative

First derivative is

$y'=re^{rx}$

Second derivative is

$y''=r*re^{rx}$

$y''=r^2e^{rx}$

Third derivative is

$y'''=r^2*re^{rx}$

$y'''=r^3e^{rx}$

now, we can plug these values into differential equation

and we get

$r^3 e^{rx}-9r^2 e^{rx}+20re^{rx}=0$

now, we can factor out common terms

$e^{rx}(r^3 -9r^2 +20r)=0$

we can move that term on right side

$(r^3 -9r^2 +20r)=0$

now, we can factor out

$r(r^2 -9r +20)=0$

$r(r-5)(r-4)=0$

now, we can set them equal

$r=0$

$r-5=0$

$r=5$

$r-4=0$

$r=4$

so, we will get

$r=0,4,5$ ...............Answer

4 0

4 years ago

Graph the function y= 2.2 - |0.4x + 1|. what are the coordinates, to the nearest tenth, of the maximum of the graph.

Andrej [43]

Answer:

Step-by-step explanation:

no explanation.......

3 0

3 years ago

Help only plz only 10 minutes

Allisa [31]

Answer:

2.5

Step-by-step explanation:

If i am correct the first rectangle is 3 and the second is 7.5.

7.5 divided by 3 equals 2.5

7 0

3 years ago

Read 2 more answers

Solve the inequality for x<br><br> 20x > 8(4x - 5) - 20

UNO [17]

Hi there! I can help you with this! First, let's combine like terms and do everything for the right side of the problem. When you do the distributive property, you get 32x - 40. Combine like terms and you'll get 32x - 60. Now, the inequality is 20x = 32x - 60. First, let's subtract 32x from both sides to get the integer by itself. When you do that, you get -12x = -60. Now, divide each side by -12 to isolate the "x". -60/-12 is 5. Let's plug it in. 20 * 5 is 100. 32 * 5 is 160. 160 - 60 is 100. 100 = 100. There. x = 5.

4 0

3 years ago

Read 2 more answers