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spin [16.1K]
2 years ago
9

Find the exact solution of x 3x^2+7=28 A.+√7 B.7 C.+7 D.-7

Mathematics
2 answers:
dolphi86 [110]2 years ago
5 0

Answer:

A. +\sqrt{7}

Step-by-step explanation:

3x^2+7=28
3(+\sqrt{7} ^{2} )+7=28

3(7)+7=28

21+7=28
28=28

Hope it helps

yulyashka [42]2 years ago
3 0

Answer:

x = ± \sqrt{7}

Step-by-step explanation:

3x² + 7 = 28 ( subtract 7 from both sides )

3x² = 21 ( divide both sides by 3 )

x² = 7 ( take square root of both sides )

x = ± \sqrt{7}

that is x = - \sqrt{7} , x = \sqrt{7}

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stepladder [879]

Answer:

Sum of all three angles inside a triangle = 180°

Total number of parts = 3 + 10 + 7 = 20

Each part = 180 ÷ 20 = 9

Let us name the three angles of this triangle as ∠1 , ∠2 and ∠3 respectively .

Number of parts for ∠1 = 3 parts

∠1 = 3 × 9 = 27°

Number of parts for ∠2 = 10 parts

∠2 = 10 × 9 = 90°

Number of parts for ∠3 = 7 parts

∠3 = 7 × 9 = 63°

The three angles of this triangle measure 27° , 90° and 63° respectively

Measure of the smallest angle = 27°

Therefore , the measure of the smallest angle = 27° .

6 0
3 years ago
Calculate the average velocity of a dancer who moves 5 m toward the left of the stage over the course of 15 s.
Neko [114]

Answer:

Divide the distance by the time and get average velocity in units of m/s.  The direction is to the left.

8 0
2 years ago
Read 2 more answers
I need the answer pleaseee​
Aleksandr [31]

Answer:

y= -3x + 150

Step-by-step explanation:

slope = -15/5

y-int = 150

7 0
3 years ago
What's 16.6666667 to the nearest tenth 
sasho [114]
16.7 is the answer rounded to the nearest tenth.
3 0
3 years ago
A woman won a 4000​-m race with a time of 12.089 min. What was her​ rate?
Blizzard [7]

Answer:

330.88 m/min  

Step-by-step explanation:

rate = distance/time

        = 4000 /12.089

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3 years ago
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