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kirill115 [55]
1 year ago
15

Original Equation:8 - 7x^2 + 3 = 4x^2 - 1Frist step:11 - 7x^2 = -4x^2 - 1Which property justifies the first step?A. Division pro

perty of equalityB. Commutative property of addition C. Addition of equality D. Multiplication property of equality
Mathematics
1 answer:
Tpy6a [65]1 year ago
7 0

8 - 7x^2 + 3 = 4x^2 - 1

8+3-7x^2 = 4x^2-1

11-7x^2 = 4x^2-1

B. Commutative property of addition

We can swap numbers and obtain the same results.

In this case, we swapped 8+3 and added them.

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Answer:

$130 - ($20+$35) is the equation

7 0
3 years ago
It took emily 25 min to rideHer bicycle to the repair shop in one hour and 15 minutes to walk back home. If Emily her bicycle to
s2008m [1.1K]

Answer:the repair shop is 5km from her house.

Step-by-step explanation:

Let x represent the distance of the repair shop from her house.

Let y represent Emily's speed when riding.

Distance = speed × time

It took Emily 25 min to ride her bike to the repair shop. Converting 25 min to hours, it becomes 25/60 = 5/12 hours.

Distance covered,

x = y × 5/12 = 5y/12

It took her 1h 15 min to walk back home. Converting to hours, it becomes 1 + 15/60 = 1 1/4 = 5/4

If she can ride her bike 8km/h faster than she can walk, it means that her speed while walking would be y 8 8

Therefore,

Distance covered,

x= 5/4(y - 8) = (5y - 40)/4

Since the distance remains the same, then

5y/12 =(5y - 40)/4

Crossmultiplying, it becomes

5y × 4 = 12(5y - 40)

20y = 60y - 480

60y - 20y = 480

40y = 480

y = 480/40 = 12

x = 5y/12 = 5 × 12/12 = 5 km

6 0
2 years ago
Find the measure of each exterior angle of a regular 56-gin
Studentka2010 [4]
The sum of the measure of the exterior angles of any polygon is 360. x represents the measure of a single exterior angle.
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The simplified fraction is 45/7
3 0
3 years ago
Jason has two bags with 6 tiles each what are the chances that he draws a 2 and a 3 with 1 through 6 tiles
liubo4ka [24]
He has a 1/6 chance.
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(i hope D:)
3 0
3 years ago
Pls answer I cannot do it
lisov135 [29]

a square number has and odd amount of numbers but 5to the power of 9 has an even amount of numbers

5×5×5×5×5×5×5×5×5

7 0
3 years ago
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