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ratelena [41]
2 years ago
9

which of the following is a quadratic equation in one variable. a.7x^2-15=32x b.x^2+y+9=0 c.3x+2y=8. d. 5x -15=0​

Mathematics
1 answer:
mestny [16]2 years ago
8 0

Answer:

a. 7x^2-15=32x

Step-by-step explanation:

a standard form quadratic equation is written as ax^2+bx+c=0

7x^2-15=32x can be rewritten into 7x^2-32x-15=0 by subtracting 32x on both sides.

options b and c don't work  because they include another variable, y

option d is a linear equation, not a quadratic

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C. The 100th term of 1, 3, 9, ... is
True [87]

Answer:

Step-by-step explanation:

Remark

We really should have 1 more term in the sequence. There could be a lot of things that determine what the sequence is. I'm going to say that each term is multiplied by 3

Givens

a1 = 1

r = 3

Formula

tn = a1 * 3^(n-1)

t100 = 1 * 3^(100 - 1)

t_100 = 3^99

t_100 = 1.72 * 10^47

This really is a scientific calculator problem. If you don't own such a thing, but you have windows 10 on your computer, go to the calculator. Go to the scientific calculator and put in these key strokes.

3

x^y

99

=

This is what you get

1.7179250691067044367882037658854e+47

Naturally, I rounded it a bit.

4 0
2 years ago
If there's a sale and the original price is 140 and it's one fifth off how much is the sale?
Alex777 [14]
$112
1-1/5=4/5
4/5 x 140 =112
hope this helps :)
6 0
2 years ago
luna mixes 3/4 cup of orange juice with 3/8 cup of cranberry juice . she gives 5/8 cup of juice to mags . how much is left in lu
DerKrebs [107]
She has 1/2 cup left. 3/4 + 3/8 equals 1 1/8 subtract that by 5/8 and you have 1/2
6 0
3 years ago
Brandon wants to test drive a Lamborghini car and he needs the key. Each key ring has 6 keys. If there are 9 key rings, how many
Harrizon [31]

Answer:

54 keys

Step-by-step explanation:

If there are 6 keys on each of the nine key rings, you times 6 by 9 to get 54.

6 0
3 years ago
If sin y° = 7 over q and tan y° = 7 over r, what is the value of sec y°?
Tomtit [17]

Answer:

Sec y = q/r

Step-by-step explanation:

Sin y = 7/q

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Mathematically cos y = sin y/tan y

But sec y = 1/cos y

So therefore sec y = tan y/sin y

So that would be ;

7/r divided by 7/q

= 7/r * q/7

= q/r

3 0
3 years ago
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