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umka2103 [35]
3 years ago
13

Solve system of linear equations by substitution. check your solution. y=3x+4 x+y=8

Mathematics
1 answer:
wlad13 [49]3 years ago
3 0
Y = 3x + 4
x + y = 8

Substitute 3x + 4 in for y in the second equation. 

x + 3x + 4 = 8

Combine like terms.

4x + 4 = 8

Subtract 4 from both sides.

4x = 4

Divide 4 off of both sides to find the value of x.

x = 1

Now plug 1 into the second equation for x.

1 + y = 8

Subtract 1 from both sides.

y = 7

(1,7) is the final answer.
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Help with this question please 10 points​
Mamont248 [21]

Answer:

x = 80

measure of exterior angle = 112°

Step-by-step explanation:

32 + x = 2x - 48 (because the measure of exterior angle is equal to the sum of the two interior angles)

32 + x = 2x - 48

32 = x - 48

x = 80

plug in,

2(80) - 48

160 - 48 = 112

4 0
3 years ago
Find f'(x). ,f(x)=radical3x+1<br>​
Juli2301 [7.4K]

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Step-by-step explanation:

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4 years ago
At the neighborhood grocery, 55 pounds of steak cost \$20.60$20.60. How much would it cost to buy 44 pounds of steak?
GuDViN [60]

Answer:

$16.48

Step-by-step explanation:

Create a proportion where x is the cost of 44 pounds of steak:

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Cross multiply and solve for x:

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4 0
3 years ago
Can a function be concave down and positive everywhere?
aivan3 [116]
<span>Can a function be concave down and positive everywhere?
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attachment 1

Can a function be increasing and be concave down everywhere?
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it can be at the ends, the middle and the other end
like in atachment 2, the circles are inflection points

Can a function have 4 zeros and two local extrema?
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</span>
8 0
3 years ago
Theoretically, if a month is chosen 300 times,
horsena [70]

Answer:

75 times.

Step-by-step explanation:

Well there are 12 months and 3 of them start with the letter J, so theoretically, 25% of the months chosen will start with the letter J because \frac{3}{12}=\frac{1}{4}, which is 25%. 25% of 300 (or \frac{300}{4}, for those who like fractions) is 75, so theoretically, we can expect a month that starts with the letter J 75 times.

Hope this helps!

<em>P.S: </em><u><em>Please mark me as brainliest!</em></u>

6 0
3 years ago
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