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egoroff_w [7]
3 years ago
8

What is the x-coordinate of the vertex of the parabola whose equation is y = 3x^2 + 12x + 5?

Mathematics
1 answer:
marshall27 [118]3 years ago
5 0
X=-2....................
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A fan is marked up 40% off the original lrice the original price was $20 whar is tge new price of the fan before sales tax
Neporo4naja [7]
10% of 20 is 2
2x4=8
20-8=12
The answer is $12
7 0
3 years ago
Find the 15th term of the arithmetic sequence 13,8,3,-2
Lunna [17]

Answer:

-57

Step-by-step explanation:

13,8,3,-2 (decreasing by 5)

13,8,3,-2,-7,-12,-17,-22,-27,-32,-37,-42,-47,-52,-57.

The 15th term is -57.

<u><em>Ace</em></u>

4 0
3 years ago
[URGENT]
Blizzard [7]

When you write URGENT the Brainly cops think you may be taking a test.

y = ax² + c thru (-1,4) and (0,8)

Substituting in the coordinates of each point for x and y gives two equations:

4 = a  (-1)² + c

8 = a (0²) + c = c

From the second one we see c=8.  Substituting into the first one,

4= a + 8

a = 4-8 = -4

Answer: a=-4, c=8

Check:

f(x) = -4x² + 8

f(0) = 8, good

f(-1) = -4(1) + 8 = 4, good

5 0
3 years ago
There are 65 children in the sixth grade. The ratio of boys to girls 3 to 2. A) how many girls are in the grade?
Akimi4 [234]

Given that,

Total number of children = 65

The ratio of boys to girls is 3 :2.

To find,

The number of girls in the grade.

Solution,

Let there are 3x girls and 2x boys.

ATQ,

3x + 2x = 65

5x = 65

x = 13

So, no of girls = 3x

= 3(13)

= 39

Hence, there are 39 girls in the grade.

5 0
3 years ago
These triangles are congruent by which triangle congruence postulate ?
svp [43]
(a) SSS (side side side)
every side on one triangle is correspondingly equal to that of the same side in the other triangle
3 0
2 years ago
Read 2 more answers
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