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3 years ago

Anyone know the answer to this one ?

Mathematics

1 answer:

lys-0071 [83]3 years ago

4 0

Answer: B) y = 2 · 3ˣ

<u>Step-by-step explanation:</u>

We can see that (2, 18) is a point on the graph.

Plug it into the equations to see which one make a true statement.

A) y = 1 · 3ˣ

18 = 1 · 3²

18 = 1 · 9

18 ≠ 9

B) y = 2 · 3ˣ

18 = 2 · 3²

18 = 2 · 9

18 = 18 This works!

C) y = 3 · 2ˣ

18 = 3 · 2²

18 = 3 · 4

18 ≠ 12

D) y = 4 · 3ˣ

18 = 4 · 3²

18 = 4 · 9

18 ≠ 36

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One day, a person went to a horse racing area. Instead of counting the number of humans an horses, he conuted 74 heads and 196 l

DerKrebs [107]

Data:

Humans (x) = 2 Legs
Horses (y) = 4 Legs

74 Heads
196 Legs

Solving:

Addition method

$\left \{ {{x + y =74} \atop {2x + 4y =196}} \right.$

Simplify by (-4) The first equation

$\left \{ {{x + y =74(-4)} \atop {2x + 4y =196}} \right.$
$\left \{ {{-4x - \diagup\!\!\!\!\!4y =-296} \atop {2x + \diagup\!\!\!\!\!4y =196}} \right.$
$\left \{ {{-4x =-296} \atop {2y =196}} \right.$
$-2x = -100.simplify(-1)$
$2x = 100$
$x = \frac{100}{2}$
$\boxed{x = 50}$

Now, to find the number of horses, I will use the following equation and I will replace the found value, we will have:

$x + y = 74$
$50+y = 74$

Number with incognito are to the left of the equality and numbers without incognito are to the right, remembering that when changing of side changes the signal.

$y = 74-50$
$\boxed{y = 24}$

Answer:
Humans = 50
Horses = 24

7 0

3 years ago

a bag contains 5 red marbles 4 blue marbles and 6 yellow marbles if 3 marbles are selected in succession what is the probability

Alex

Answer:

5/243

Step-by-step explanation:

4/18 × 6/18 × 5/18 = 5/243

I think

6 0

3 years ago

PLEASE HELP THIS WAS SUPPOSED TO BE TURNED IN BY 12:00

Strike441 [17]

Answer:

Step-by-step explanation:

7 0

3 years ago

Read 2 more answers

Last year, Josh had $20,000 to invest. He invested some of it in an account that paid 7% simple interest per year, and he invest

Ilya [14]

Answer: $12000 was invested at 7% while $8000 was invested at 9%.

Step-by-step explanation:

Based on the information given in the question, let the amount that was invested at 7% be n.

Therefore,

0.07n + 0.09(20000 - n) = 1560

0.07n + 1800 - 0.09n = 1560

-0.02n = 1560 - 1800

-0.02n = -240

n = 240/0.02

n = 120

Therefore, $12000 was invested at 7% while $8000 was invested at 9%.

3 0

3 years ago

What is 4.345 x 10^5 in standard form?

zalisa [80]

Answer:

Choice D.) 434,500

Step-by-step explanation:

What is 4.345 x 10^5 in standard form?

4.345 x 10^5 = 4.345 * 100,000

multiply it out:

4.345 x 10^5 = 434,500

3 0

3 years ago