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3 years ago

So there are 28 butterflies. Since there are 47 total, this means there are 47-28 = 19 spiders.

Mathematics

1 answer:

Umnica [9.8K]3 years ago

6 0

Answer:

Yes you are correct! :)

Step-by-step explanation:

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A car costs £5000 when new. Each year the value decreases by 20%. Person A said that the car would be worth nothing in 5 years.

den301095 [7]

Answer:

£1638.40

Step-by-step explanation:

Step one:

Given data

A car costs £5000 when new

Each year the value decreases by 20%.

Step two:

let us compute the worth in the next 5 years

year 1

worth= 5000- 0.2*5000

worth= 5000-1000

worth= £4000

year 2

worth= 4000- 0.2*4000

worth= 4000-800

worth= £3200

year 3

worth= 3200- 0.2*3200

worth= 3200-640

worth= £2560

year 4

worth= 2560- 0.2*2560

worth= 2560-512

worth= £2048

year 5

worth= 2048- 0.2*2048

worth= 2048-409.6

worth= £1638.40

The person is wrong because after 5 years the car is worth £1638.40

4 0

3 years ago

-x^2+2x-8=0 factoring

kramer

(-x-2) (x-4) are the factor of this equation

6 0

3 years ago

Which expression is equivalent to 2w?

kotykmax [81]

Answer:

2w - w would be equal to w. w + 2 is just w + 2

Step-by-step explanation:

please give brainlist if this helped

8 0

3 years ago

Put these in order, using brackets and set notation.<br> 3/5, 3/2, 3/7, 3/10, 1/3

jenyasd209 [6]

[3/2][1/3][3/5][3/7][3/10]

4 0

3 years ago

A biologist has been observing a tree's height. This type of tree typically grows by 0.22 feet each month. Fifteen months into t

Lyrx [107]

Data:

x: number of months

y: tree's height

Tipical grow: 0.22

Fifteen months into the observation, the tree was 20.5 feet tall: x=15 y=20.5ft (15,20.5)

In this case the slope (m) or rate of change is the tipical grow.

m=0.22

To find the line's slope-intercep equation you use the slope (m) and the given values of x and y (15 , 20.5) in the next formula to find the y-intercept (b):

$\begin{gathered} y=mx+b \\ 20.5=0.22(15)+b \\ 20.5=3.3+b \\ 20.5-3.3=b \\ 17.2=b \end{gathered}$

Use the slope(m) and y-intercept (b) to write the equation:

$\begin{gathered} y=mx+b \\ \\ y=0.22x+17.2 \end{gathered}$ A) This line's slope-intercept equation is: y=0.22x+17.2

B) To find the height of the tree after 29 months you substitute in the equation the x for 29 and evaluate to find the y:

$\begin{gathered} y=0.22(29)+17.2 \\ y=6.38+17.2 \\ \\ y=23.58 \end{gathered}$ Then, after 29 months the tree would be 23.58 feet in height

C) In this case as you have the height and need to find the number of moths you substitute the y for 29.96feet and solve the equation for x, as follow:

$\begin{gathered} 29.96=0.22x+17.2 \\ 29.96-17.2=0.22x \\ 12.76=0.22x \\ \frac{12.76}{0.22}=x \\ \\ 58=x \end{gathered}$ Then, after 58 months the tree would be 29.96feet tall

3 0

1 year ago