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True [87]
3 years ago
8

-3x(4+(-7)) in distributive property

Mathematics
1 answer:
Liula [17]3 years ago
8 0
Answer: 9

explanation:
4+(-7)= -3
next, you multiply -3 and -3 which is 9 as the two negatives cancel out
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For what value of k will the lines x+2y=0, 3x-4y-10=0 and 5x+ky-7=0 are concurrent?​
konstantin123 [22]

Answer:

After solve the equations we get value of k=3

Step-by-step explanation:

We need to find value of k for which the lines x+2y=0, 3x-4y-10=0 and 5x+ky-7=0 are concurrent.

If the lines are concurrent, they pass through same point.

Let:

x+2y=0--eq(1)\\ 3x-4y-10=0--eq(2)\\ 5x+ky-7=0--eq(3)

First solving equation 1 and 2 to find values of x and y

From eq(1) we find value of x and put it in eq(2)

From \ eq(1) x+2y=0\\x=-2y\\Put x=-2y \ in \ eq(2)\\3x-4y-10=0\\3(-2y)-4y-10=0 \\-6y-4y=10\\-10y=10\\y=\frac{10}{-10}\\y=-1

After solving we get value of y=-1

Now putting in eq(1) to get value of x

x+2y=0\\x+2(-1)=0\\x-2=0\\x=2

So, Value of x= 2

Now put value of x=2 and y=-1 into eq(3) to find value of k

5x+ky-7=0\\5(2)+k(-1)-7=0\\10-k-7=0\\-k+3=0\\-k=-3\\k=3

So, After solve the equations we get value of k=3

4 0
3 years ago
I need help, along with an explanation, for this question.
Aleksandr-060686 [28]

Answer:

1.  -9

2.  -15

Step-by-step explanation:

Reduce the expression, if possible, by cancelling the common factors.

8 0
3 years ago
C
r-ruslan [8.4K]

Answer:

soryyyyyyyyyyyyyyyy

Step-by-step explanation:

4 0
2 years ago
The product of two numbers is 42.63. If one number is 2.1, find the other. *
dybincka [34]

Answer:

20.3

Step-by-step explanation:

42.63=2.1*x

42.63/2.1=x

20.3=x

Please mark me as brainliest

7 0
3 years ago
0.0417 in scientific notation
Maurinko [17]
4.17 x 10^-2 is the answer
5 0
3 years ago
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