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Alex_Xolod [135]
3 years ago
11

What is the value of 2x + y2 − xy for x = 1 and y = 4? A. 14 B. 2 C. 6 D. 22

Mathematics
1 answer:
ratelena [41]3 years ago
8 0
The correct answer is C.

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Line L1 passes through points P(n,4) and Q(1,-2). Line L2 passes through R(4,3) and S(1,5). What is the value of n if the lines
Elena L [17]

Answer:

<h3>n = -8</h3>

Step-by-step explanation:

For two lines to be parallel, they must have the same slope

Get the slope of each line

For L1;

m1 = -2-4/1-n

m1 = -6/1-n

For L2;

m2 = 5-3/1-4

m2 = 2/-3

m2 = -2/3

Since they have the same slope, m1 = m2

-6/1-n = -2/3

6/1-n = 2/3

Cross multiply

2(1-n) = 6(3)

2-2n = 18

-2n = 18 - 2

-2n = 16

n = -16/2

n = -8

Hence the value of n is -8

4 0
2 years ago
Evaluate the expression and enter your answer below.
jeka94

Answer:

The answer is 9.

Step-by-step explanation:

PEMDAS (Parentheses, Exponents, Multiplication, Division, Addition, and Subtraction)

3x10+15-6^2

3x10+15-36

30+15-36

45-36

9

7 0
3 years ago
Read 2 more answers
98-x2=0 solve this with the quadratic formula
Mars2501 [29]

Answer:

             x∈{-7√2, 7√2}

Step-by-step explanation:

98-x^2=0\\\\-x^2+98=0\\\\a=-1\,,\ \ b=0\,,\ \ c=98\\\\x_1=\dfrac{-0-\sqrt{0^2-4\cdot(-1)\cdot98}}{2\cdot(-1)}=\dfrac{-\sqrt{4\cdot49\cdot2}}{-2}=\dfrac{-2\cdot7\sqrt{2}}{-2}=7\sqrt2\\\\x_2=\dfrac{-0+\sqrt{0^2-4\cdot(-1)\cdot98}}{2\cdot(-1)}=\dfrac{2\cdot7\sqrt{2}}{-2}=-7\sqrt2

7 0
3 years ago
Which choice is equivalent to the expression below √-12
kondaur [170]

Answer:

E

Step-by-step explanation:

using the rule of radicals

\sqrt{a} × \sqrt{b} ⇔ \sqrt{ab}, hence

\sqrt{-12}

= \sqrt{4(3)(-1)} = \sqrt{4} × \sqrt{3} × \sqrt{-1} [\sqrt{-1} = i]

= 2i\sqrt{3} → E


7 0
3 years ago
Read 2 more answers
QUICK! Giving brainliest to correct answer
garri49 [273]

Answer:

Dominos is the better deal.

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