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andreev551 [17]
3 years ago
11

I need help on this and the first person that answer this correctly gets a BRANLIST(answer if you know)​

Mathematics
2 answers:
tresset_1 [31]3 years ago
4 0

Answer:

the currect answer is C

Step-by-step explanation:

irakobra [83]3 years ago
3 0

Answer:

C

Step-by-step explanation:

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Help please, I attached the question. Is it a!? <br> 
AVprozaik [17]

Answer:

A

Step-by-step explanation:

Recall that for a quadratic equation of the form:

0=ax^2+bx+c

The number of solutions it has can be determined using its discriminant:  

\Delta = b^2-4ac

Where:

  • If the discriminant is positive, we have two real solutions.
  • If the discriminant is negative, we have no real solutions.
  • And if the discriminant is zero, we have exactly one solution.

We have the equation:

2x^2+5x-k=0

Thus, <em>a</em> = 2, <em>b</em> = 5, and <em>c</em> = -<em>k</em>.

In order for the equation to have exactly one distinct solution, the discriminant must equal zero. Hence:

b^2-4ac=0

Substitute:

(5)^2-4(2)(-k)=0

Solve for <em>k</em>. Simplify:

25+8k=0

Solve:

\displaystyle k = -\frac{25}{8}

Thus, our answer is indeed A.

3 0
2 years ago
Read 2 more answers
What is a interior angles in geometry
Inga [223]

Answer:

interior angle. noun. Any of the four angles formed between two straight lines intersected by a third straight line. An angle formed inside a polygon by two adjacent sides.

Step-by-step explanation:

8 0
3 years ago
When a number is increased by 5% the result is 25 what is the original number to the nearest 10th
lbvjy [14]
The original number to the nearest tenth is 23.8
3 0
2 years ago
Ruby red paint costs $0.50 per square inch. A ball is painted ruby red and costs $100.00 to paint. What is the diameter of the b
8090 [49]
The diameter can be obtained by the formula A = pi*r^2

First, multiply 0.50 * 100 to obtain the area of the ball, then simplify and solve for the radius. Doubling the radius would yield the diameter. This is shown below:

Area of the ball = 0.50 * 100 = 50 in^2
<span>A = pi*r^2
</span>50 = (3.14)*r^2
r = 3.99 = approx. 4
diameter = 2r
Diameter = 8 inches.

Among the choices, the correct answer is C. 8.0 in. 

6 0
3 years ago
Read 2 more answers
Roman solved the equation 5a+2b=10 for a. His steps are shown below. 1. Subtract 2b: 5a+2b-2b=10-2b 2. Multiply by 5: 5a+10-2b W
VladimirAG [237]

Answer:

In step 2, he needed to divide both sides of the equation by 5

Step-by-step explanation:

we have

5a+2b=10

Solve for a------> That means isolate the variable "a"

step 1

Subtract 2b to both sides

5a+2b-2b=10-2b

5a=10-2b

step 2

Divide by 5 both sides

5a/5=(10-2b)/5

a=(10-2b)/5

3 0
2 years ago
Read 2 more answers
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