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SIZIF [17.4K]
3 years ago
12

Choose the correct simplification of the expression (−2x + 8y)(9x − 3y).

Mathematics
2 answers:
Romashka-Z-Leto [24]3 years ago
6 0
For these kinds of expressions use FOIL (first, outside, inside, last).

-2x • 9x = -18x^2
-2x • -3y = 6xy
8y • 9x = 72 xy
8y • -3y = -24y^2

Now combine them all:

-18x^2 + 78xy - 24y^2
tangare [24]3 years ago
6 0

Answer:

The answer is A I just took the test

Step-by-step explanation:

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Charra [1.4K]

Answer:

Step-by-step explanation:

x=0.6121212... (1)

10x=6.121212...   (2)

1000 x=612.121212...   (3)

(3)-(2) gives

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4 0
3 years ago
Read 2 more answers
Determine if direct variation x-2y=0
Fofino [41]

Answer:

x-2y=0 is a direct variation

Step-by-step explanation:

Direct variation is of the form

y= kx

Can we get the equation in that form

x-2y =0

Add 2y to each side

x-2y+2y =0_2y

x=2y

Divide each side by 2

x/2 = 2y/2

1/2x =y

Flip the sides

y = 1/2x

This is of the form y= kx where k = 1/2

x-2y=0 is a direct variation

3 0
3 years ago
Robbert wants to put lights around the edge of his yard.The yard if 40 feet long and 23 feet wide.How many yards of light does h
slega [8]

Answer:

102.222 square yards of light.

Step-by-step explanation:

From the above question, the yard had the dimensions 40 feet long and 23 feet wide.

Hence, the yard is rectangular in shape.

We have to find the area of the yard.

The formula is given as:

Area = Length × Width

= 40 feet × 23 feet

= 920 square feet

Converting to yards

1 square foot = 0.111 square yard

920 square feet = x

Cross Multiply

x = 920 × 0.111 square yard

x = 102.222 square yards.

Therefore, Robbert would need 102.222 square yards of light.

6 0
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