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Tems11 [23]
3 years ago
5

Somebody know how to do this?

Mathematics
1 answer:
Lubov Fominskaja [6]3 years ago
6 0

Answer:

x=1

Step-by-step explanation:

55+70=125

sum of angles in a triangle is 180 so

180-125=55

54x+1=55

x=1

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I need help with questions number seven and ten. <br> Answering will give you 28 pts
Anika [276]

Answer:

#7=A

#10=

Step-by-step explanation:

for #10 idk the answer but its kind of similar to number 7

sorry


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3 years ago
The following table gives annual life insurance premiums per $1,000 of face value. Use the table to determine the annual premium
Papessa [141]
The answer would be C !
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2 years ago
Read 2 more answers
2x^3y + 18xy - 10x^2y - 90y Part A: Rewrite the expression so that the GCF is factored completely.
KATRIN_1 [288]
2(x^3y+9xy-5x^2y-45y)
4 0
3 years ago
I'd really appreciate some help on these questions, I'm really struggling
nikklg [1K]
We can use linear combinations of the equations to eliminate variables.

3x - 4y = 1
-2x + 3y = 1

To eliminate y we'll make the linear combination of 3 times the first equation minus four times the second. 

9x - 12y = 3
-8x + 12y = 4

Adding,
x = 7

We could solve for y directly but let's use another linear combination, twice the first plus three times the second:

2(3x - 4y) + 3(-2x + 3y)= 2(1)+3(1)

y = 5

Check: 3(7)-4(5)=1 good.   -2(7)+3(5)=1 good.

Q18 Answer: (7,5)

y = -3x + 5
5x - 4y = -3

4y +1(5x - 4y) = 4(-3x + 5) + 1(-3)

5x = -12x + 20 -3

17 x = 17

x = 1
y = -3(1) + 5 = 2
Check: 5(1) - 4(2) = -3 good

Q19 Answer (1,2)

6x + 5y = 25
x = 2y + 24
6x = 12y + 144
5y = 25 - 12y - 144
17y = -119
y = -119/17= -7
x = 2y+24= 10
Check: 6(10)+5(-7)=25 good   2y+24=2(-7)+24=10=x good

Q20 Answer (10,-7)


3x + y = 18
-7x + 3y = -10
9x  + 3y = 54
9x - -7x = 54 - -10
16x = 64
x=4
y = 18 -3x = 18-12=6

Check: 3(4)+6=18 good,  -7(4)+3(6)=-10 good

Q21 Answer: (4,6)

6 0
3 years ago
Find the variance for the following data set: 88, 40, 10, 52, 33, 55, and 86.
musickatia [10]

Answer:

Variance s2 = 788.33333

Standard Deviation s = 28.077274

Count n = 7

Mean x¯¯¯ = 52

Sum of Squares SS = 4730

Step-by-step explanation:

7 0
2 years ago
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