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Irina18 [472]
3 years ago
7

What numbers have a sum of 20 and the difference is 4

Mathematics
2 answers:
kvv77 [185]3 years ago
8 0

Answer:

<u>The</u><u> </u><u>numbers</u><u> </u><u>are</u><u> </u><u>1</u><u>2</u><u> </u><u>and</u><u> </u><u>8</u>

Step-by-step explanation:

let the numbers be x and y :

x + y = 20 -  -  - (a) \\ x - y = 4 -  -  - (b)

add (a) and (b):

2x + 0y = 24 \\ 2x = 24 \\ x = 12

find y:

x + y = 20 \\ 12 + y = 20 \\ y = 20 - 12 \\ y = 8

balu736 [363]3 years ago
6 0

Answer:

16 and 2

Step-by-step explanation:

I'm not sure honestly if this is correct, but I hope this helps.

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use the matrix tool to solve the system of equations enter the answer as an ordered pair. 8x+5y=9 -x+y=7
Dimas [21]

Answer:

x = -44/13

y = -65/13

Step-by-step explanation:

Using matrix form means using the crammers rule

The matrix form of the expression is written as;

\left[\begin{array}{ccc}8&5\\-1&1\\\end{array}\right] \left[\begin{array}{ccc}x\\y\\\end{array}\right] = \left[\begin{array}{ccc}9\\7\\\end{array}\right]

AX = B

taking the determinant of A;

|A| = 8(1) - 5(-1)

|A| = 8 + 5

|A| = 13

After replacing the first row with the column matrix;

A_x =\left[\begin{array}{ccc}9&5\\7&-1\\\end{array}\right]

|Ax| = 9(-1)-5(7)

||Ax| = -9 - 35

|Ax| = -44

x = |Ax|/|A|

x = -44/13

similarly for y

A_x =\left[\begin{array}{ccc}8&9\\-1&7\\\end{array}\right]

|Ay| = 8(7)+9

|Ay| = 56+9

|Ay| = 65

y = |Ay|/|A|

y = -65/13

6 0
3 years ago
Which is bigger 4lb or 60 oz
Bond [772]

the answer should be 4 lbs

hope this helps

let me know please

4 0
3 years ago
The picture is there​
aliina [53]

Answer:

Step-by-step explanation:

Because CB = 6 cm, we can find CD

Use Triangle CDB.

<BCD = <BCA - <ACD

<BCD = ?

<BCA = 90

<ACD = 60

<BCD = 90 - 60

<BCD = 30

Cos 30 = CD / CB

CD = Cos(30) * BC

CD = 5.196 cm

<A = 90 - ACD

<ACD = 60

<A = 90 - 60

<A = 30

Sin(<A) = CB / AB

AB = CB / sin(<A)

AB = 6 / 0.5

AB = 12

Area =1/2 CD * AB

Area = 1/2 * 5.196 * 12

Area = 31.18

4 0
3 years ago
Solve x please 2x/3=4
Semenov [28]
Multiply both siase of equation by 3
2x*3/3=4*3
2x=12
devide by 2
2x:2=12:2
x=6
Answer: x=6
7 0
3 years ago
Read 2 more answers
8 gallons of soil are needed to fill 6 large plant pots. How many gollons are needed to fill 8 pots? Give your answer as a mixed
sineoko [7]

Answer:

10 6/10

Step-by-step explanation:

8/6 = 1.333

1.333 x 8 = 10.667

as a mixed number: 10 6/10

8 0
3 years ago
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