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4 years ago

X2 - 4x + y2 + 8y = -4

Mathematics

1 answer:

mylen [45]4 years ago

4 0

Exactly what is your question?

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(2r - 6)(-5r+4) what is the product

Akimi4 [234]

Answer:

$-10r^{2} +38r-24$

Step-by-step explanation:

Apply FOIL method: $(a+b)(c+d)=ac+ad+bc+bd$

$a=2r,b=-6,c=-5r,d=4$

$=2r(5-r)+2r*4+(-6)(-5r)+(-6)*4$

Apply minus - plus rules

$+(-a)=-a,(-a)(-b)=ab$

$=-2*5rr+2*4r+6*5r-6*4$

Simplify

Multiply $-2*5rr=-10r^{2}$

$=-10r^{2} +2*4r+6*5r-6*4$

Multiply $2*4r=8r$

$=-10r^{2} +8r+6*5r-6*4$

Multiply $6*5r=30r$

$=-10r^{2} +8r+30r-6*4$

Combine like terms

$=-10r^{2} +38r-6*4$

Multiply $-6*4=-24$

$=-10r^{2} +38r-24$

$-10r^{2} +38r-24$

6 0

3 years ago

Find the volume. I will award best answer!! Please help me

Brums [2.3K]

Answer:

1512

Step-by-step explanation:

18 times 21 times 8 = 3024

since it's a triangular prism, u half it

3024 div 2 = 1512

6 0

3 years ago

14.

FromTheMoon [43]

Answer:

a) 200 yards

Step-by-step explanation:

Difference in the distance = 50 yards

Difference in speed = 8 - 6 = 2 y/s

Time to cover the gap is:

50/2 = 25 seconds

Sandra will run the distance:

25*8 = 200 yards

8 0

3 years ago

Read 2 more answers

Calculate δe, if q= 0.769 kj and w= -860 j .

Andreyy89

Best Answer: 1) Q is positive therefore the process is endothermic. .769kj+-.810kj=-.041kj 2) Heat is released meaning it is exothermic. -66.9kj+45=-21.9kj 3) 7.29kj. Endothermic.

7 0

3 years ago

What is the general term equation, an, for the arithmetic sequence 9, 5, 1, −3, . . . , and what is the 21st term of this sequen

marin [14]

Hello :
the general term equation, an, for the arithmetic sequence is :
An = A1+d(n-1)
A1 : the first term and : d the common diference
in this exercice :
A1 = 9
d =(-3)-(1) =(1)-(5) =(5) -(9) = -4
An = 9-4(n-1)
An = -4n +13

4 0

3 years ago