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aliina [53]
3 years ago
13

Choose the correct simplification of the expression (−2x + 4y)(3x − 7y).

Mathematics
1 answer:
Rudik [331]3 years ago
3 0
-2x • 3x = -6x2 (the 2 is an exponent)
4y • -7y = -28y2 (the 2 is an exponent)
-2x • -7y = 14xy
4y • 3x = 12xy
14xy + 12xy = 26xy

—> -6x2(expo) - 28y2(expo) + 26xy

Check the answer again just to be sure, it’s been a while since I’ve had algebra!
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Which is bigger 1/3 or 3/5​
GuDViN [60]

Answer: 3/5

Step-by-step explanation: Notice that the fractions that we are comparing in this problem have different denominators. When fractions have different denominators, they are called unlike fractions.

To compare unlike fractions, we must first get a common denominator. The common denominator of 3 and 5 will be the least common multiple of 3 and 5 or 15.

To get a 15 in the denominator of 1/3, we multiply the numerator and the denominator by 5 which gives us 5/15.

To get a 15 in the denominator of 3/5, we multiply the numerator and the denominator by 3 which gives us 9/15.

Notice that we now have like fractions since both fractions have a 15 in the denominator.

To compare like fractions, we simply look at the numerators.

9/15   -   5/15

Since 9 is greater than 5, 9/15 is greater than 5/15.

This means that 3/5 is bigger than 1/3.

3 0
3 years ago
Read 2 more answers
Explain how you can use base-ten blocks or as a decimal models to find 3.15 divided by 3. Include pictures to support your expla
AlladinOne [14]
You have to turn the number or ratio and simplified the number and put it in to the chart like the norm number

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5 0
3 years ago
How much do you need to subtract from 67/10 to make 6
Artist 52 [7]

Answer:

7/10

Step-by-step explanation:

67/10-60/10=7/10

7 0
3 years ago
Read 2 more answers
Help with these questions ​
love history [14]

Answer: a) -27, b) 35, c) 14

Step-by-step explanation:

a) When a positive number is multiplied by a negative number, your answer is negative, and since we know that 9 × 3 = 27, and that this figure has to be negative (since 9 is negative), the answer is -27.

b) Multiplying two negative numbers gives a positive number, and since 7 × 5 = 35, the answer is positive 35 (as both 7 and 5 in the original question are negative).

c) Follows just like b.

8 0
3 years ago
PLEASE HELP
irina [24]
Take the longer leg length as x

(x-8)^2+x^2=(x+8)^2 \\ \\ x^2-16x+64+x^2=x^2+16x+64 \\ \\ x^2-32x=0

Use the formular
x={ \frac{-b+ \sqrt{ b^2-4ac}}{2a} } \\ \\ x={ \frac{32+32}{2} } \\ \\ x=32

∴ shorter leg = 32 - 8 = 24ft
longer leg = 32ft
hypotenuse = 32 + 8 = 40ft
8 0
3 years ago
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