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ahrayia [7]
3 years ago
13

David was thinking of a number. David doubles it, then adds 3 to get an answer of 81.6. What

Mathematics
1 answer:
Sedaia [141]3 years ago
5 0

Answer:

39.3

Step-by-step explanation:

81.6 - 3 = 78.6

78.6 ÷ 2 = 39.3

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What polynomial must be added to 3x2 + 4x + 7 to obtain the sum of 0?
Dovator [93]

Answer:

do (3x2+4x+7)+y=0

y=-3x^2-4x-7

5 0
3 years ago
Solve for x X - 1/2 (8 - x) = x + 3(4 - x) - x<br> A) -32/9<br> B) -9/32<br> C) 32/9<br> D) 9/32
Greeley [361]

Option C

x = \frac{32}{9}

<em><u>Solution:</u></em>

x - \frac{1}{2} \times (8 - x) = x + 3(4 - x) - x

We have to solve for "x"

From given,

x - \frac{1}{2} \times (8 - x) = x + 3(4 - x) - x

Solve for brackets

Use distributive property

a(b + c) = ab + ac

Therefore,

x - 4 + \frac{x}{2} = x + 12 - 3x - x

Combine the constants

x + \frac{x}{2} = x - x - 3x + 12 + 4\\\\x + \frac{x}{2} = -3x + 16

Move the variables to left side of equation

x + \frac{x}{2} + 3x = 16

Combine the like terms

2x + x + 6x = 32\\\\9x = 32\\\\x = \frac{32}{9}

Thus option C is correct

3 0
4 years ago
Enter 8/10 as hundredths.
pentagon [3]

Answer:

0.8 or .8

Step-by-step explanation:

multiply the top and bottom by 10

so 8/10=80/100

to get the decimal form, just divide 8 by 10 and it should give you 0.8

4 0
3 years ago
What is the solution to {2x +3y=11 and 3x+3y=18
ra1l [238]

Answer:

The ordered pair that satisfies the equation is (7, -1)

Step-by-step explanation:

In order to find this, we can solve by subtracting. Start by stacking the two equations on top of one another and subtracting like terms.

3x + 3y = 18

(-) 2x + 3y = 11

--------------------

x = 7

Now that we have the value for x, we can plug in to either equation to find y.

2x + 3y = 11

2(7) + 3y = 11

14 + 3y = 11

3y = -3

y = -1

5 0
3 years ago
An 18-foot piece of rope costs $17.82. What is the price per yard?​
Masja [62]
17.82 / 18 = .99

.99 per yard!
3 0
3 years ago
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