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3 years ago

20 +63 without rewriting find the sum using mental math

2 answers:

7 0

20+63.

To add in your head, just take the 3 in 63 and add the 0 from the 20 to it. That leaves 3 right? And then take the 6 in 63 and add the 2 from the 20. This comes out to:

83

Soloha48 [4]3 years ago

7 0

83 is the answer hope I helped you

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The sizes of four cell phone displays are 5.6 inches, 53

swat32

Answer: The longest display is 47.75 inches longer than the shortest display.

Step-by-step explanation:

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2 years ago

What type of system is the following set of equations?

iVinArrow [24]

$-3x+y=-2 \\
y-4=-6x \ \ \ |\times (-1) \\ \\
-3x+y=-2 \\
\underline{-y+4=6x} \\
-3x+y-y+4=6x-2 \\
-3x+4=6x-2 \\
-3x-6x=-2-4 \\
-9x=-6 \\
x=\frac{-6}{-9} \\
x=\frac{2}{3} \\ \\
y-4=-6 \times \frac{2}{3} \\
y-4=-4 \\
y=-4+4 \\
y=0 \\ \\
(x,y)=(\frac{2}{3},0)$

The system has one solution so it's A. consistent and independent.

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2 years ago

Carlos and Michael are collecting baseball cards. Carlos has 85 and buys 10 more each week. Michael has 120 and receives 5 more

GarryVolchara [31]

Answer:

Michael and Carlos will have the same amount after 7 weeks

Step-by-step explanation:

Assume the total number of baseball cards that Carlos and Michael need to have to be equal is y, and the amount of time in terms of weeks that it will take for this to be achieved is x.

The following expressions can be derived

For Carlos to achieve y, he will need 85 and an addition of 10 per week (x):

y=85+(10x)..........equation 1

For Michael to achieve y, he will need 120 and an addition of 5 per week (x):

y=120+(5x)..........equation 2

Equating equation 1 and 2 to solve for x

85+10x=120+5x

10x-5x=120-85

5x/5=35/5

x=7

Number of weeks it will take Michael and Carlos to have the same amount=x=7 weeks

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2 years ago

Slope m = -2 and y -intercept b = -1

algol [13]

Y = -2m -1 is your equation

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3 years ago

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Use the chart to multiply the binomial by the trinomial.

sukhopar [10]

Answer: " -2y³ + 3y²<span> + 27y " .
_______________________________________________________
Refer to the completed chart below (image attached).</span>
_______________________________________________________
Using the completed chart below (image attached), we can write out the terms:
__________________________________________________
y³ − 3y³ + 9y² + 3y² − 9y² + 27y ;

Then, we can combine the "like terms" ;
__________________________________________
y³ − 3y³ = -2y³ ;

+9y² + 3y² − 9y² = + 3y² ;
___________________________________________________________
to get: -2y³ + 3y² ; and bring down the "+27y" ;
___________________________________________________________
Answer: " -2y³ + 3y²<span> + 27y " . </span>Refer to chart below (image attached).
___________________________________________________________

5 0

3 years ago

Read 2 more answers