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2 years ago

Simplify expression- 9a-4(2a+5)

1 answer:

5 0

Apply the distributive property.
9
a
−
4
(
2
a
)
−
4
⋅
5
9
a
-
4
(
2
a
)
-
4
⋅
5
Multiply
2
2
by
−
4
-
4
.
9
a
−
8
a
−
4
⋅
5
9
a
-
8
a
-
4
⋅
5
Multiply
−
4
-
4
by
5
5
.
9
a
−
8
a
−
20
Subtract
8
a
8
a
from
9
a
9
a
.

a-20

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If each foot of water in a lake screens out 60% of the light above, what percent of the light passes through 5 feet of water?

BartSMP [9]

The amount of light passing through each foot the water in the lake = 100% - 60% = 40%
The percent of light passing through 5 feet of water = 0.4^5 = 0.01024 = 1.02%

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3 years ago

Describe a real-world situation that the graph could represent. Then describe the possible values for each variable

Alex777 [14]

Answer:

$Speed=distance/time$ i.e. relation between speed-distance-time is one such situation that can be modeled using graph

Step-by-step explanation:

There are many real world examples that can be modeled using graph. Graphs are represented on co-ordinate planes, so any real world example that can be represented by use of linear equation can be represented onto a graph.

One such example, is speed-distance-time relation. Uniform speed can be represented on a graph as shown in figure.

So, the equation for speed is represented by equation as follows:

$Speed=distance/time$

So, if we take distance on y axis and time on x axis with points as (distance,time)

(0,0) ==> $v=0/0=0$

(1,2) ==> $v=1/2=0.5$

(2,2) ==> $v=2/2=1$

the following points 0,0.5,1 will be plotted on graph. Similarly, more values can be plotted by assuming values for distance and time.

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3 years ago

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Eddi Din [679]

Answer:

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Step-by-step explanation:

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2 years ago

Please answer today!

Svet_ta [14]

Answer:

#1. A. C. D.

#2. D. F.

3^4 equals 81 and so do answer D. & F.

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2 years ago

Read 2 more answers

You have been saving $12 each week for many weeks. One day, you decide to count your savings and find that you have $384. Choose

Alex_Xolod [135]

Answer:

D or the last one.

Step-by-step explanation:

Honestly, you got me kinda confused. Is it saying that there is multiple equations to answer this? Well anyways, D would be the answer. When the variable (w) is beside the coefficient, it means you multiple them together. (W) standing for weeks multiplied by 12 which is how much you earn each week would get you the total amount. The rest just don't make sense.

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2 years ago