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lukranit [14]
3 years ago
13

Find the percent decrease, Round to the nearest percent: From 90 points to 45 points.

Mathematics
2 answers:
ira [324]3 years ago
7 0
The answer  will be 45 points cause you subtract 45 from 90

Delvig [45]3 years ago
4 0

Answer:

The decrease in percent is 50 %

Step-by-step explanation:

Initial point is 90 while the final point is 45. We need to find the percent decrease. Percent change is given by :

\% =\dfrac{\text{change}}{\text{original amount}}\times 100

\% =\dfrac{90-45}{90}\times 100

\%=50\%

So, the percent decrease is 50 percent. Hence, this is the required solution.

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A=21+2

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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]

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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
My opposite sides are parallel., and equal in length.All of my angles are equal in sides.
brilliants [131]

Hiya!

The answer is: quadrilateral

Every side of a quadrilateral are parralle and has the same length.

A quadrilateral is a 2-dimensional closed shape with four straight sides.

Have a nice day

4 0
3 years ago
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