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2 years ago

8

Which shows the equation below written in the form ax2 + bx + c = 0?

2 answers:

lisabon 2012 [21]2 years ago

4 0

${x}^{2} + 7x + 9 = 3 \\ {x}^{2} + 7x + 9 - 3 = 0 \\ {x }^{2} + 7x + 6 = 0$
The answer should be B

beks73 [17]2 years ago

4 0

Answer:

B

Step-by-step explanation:

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eight more than the product of four and a number is equivalent to seven less than the same number in equation form.

Georgia [21]

4n + 8 = n - 7
(In which 'n' represents the unknown number)

(4n + 8): "Eight more than the product of four and a number"

(= n - 7): "Is equivalent to seven less than the same number in equation form."

Subtract 8 from both sides:
4n = n - 15

Subtract n from both sides:
3n = -15

Divide both sides by 3:
n = -5

5 0

3 years ago

The human population of the earth can be modeled by p(T)=3.1(1.016)^t , where T represents the number of year since 1963 , and p

Mkey [24]

Answer:

See below

Step-by-step explanation:

<u>Given function:</u>

p(t)=3.1(1.016)^t

<u>The base of the growth rate is:</u>

1.016 = 1 + 0.016

It represent a 1.6% of growth per year.

A.

Increasing

B.

<u>p(55) = 7.42 means:</u>

55 years after 1963, in the year 2018, the population of Earth is 7.42 billions

7 0

2 years ago

The height of a right circular cylinder is 1.5 times the radius of the base. What is the ratio of the total surface area to the

Naily [24]

Let r represent the radius of cylinder.

We have been given that the height of a right circular cylinder is 1.5 times the radius of the base. So the height of the cylinder would be $1.5r$ .

We will use lateral surface area of pyramid to solve our given problem.

$LSA=2\pi r h$ , where,

LSA = Lateral surface area of pyramid,

r = Radius,

h = height.

Upon substituting our given values in above formula, we will get:

$LSA=2\pi r\cdot (1.5)r$

Now we will find the total surface area of cylinder.

$TSA=2\pi r(r+h)$

$TSA=2\pi r(r+1.5r)$

$TSA=2\pi r(2.5r)$

$\frac{TSA}{LSA}=\frac{2\pi r(2.5r)}{2\pi r(1.5r)}$

$\frac{TSA}{LSA}=\frac{2.5r}{1.5r}$

$\frac{TSA}{LSA}=\frac{25}{15}$

$\frac{TSA}{LSA}=\frac{5}{3}$

Therefore, the ratio of total surface area to lateral surface area is $5:3$ .

4 0

2 years ago

What is the answer of 6.39 ÷ 0.3

Ad libitum [116K]

You can use a calculator online you know? It is 21.3

4 0

3 years ago

Read 2 more answers

How much would you need to deposit in an account now in order to have $3000 in the account in 15 years? Assume the account earns

Rzqust [24]

Answer:

Principal = Total ÷ (1 + Rate)^years

That formula is found here: http://www.1728.org/compint2.htm

Principal = 3.000 / (1.03) ^ 15

Principal = 3.000 / 1.5579674166

Principal = $1,925.59

Step-by-step explanation:

7 0

2 years ago