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olga_2 [115]
3 years ago
5

Isabella spends $4.87 on paintbrushes and paint. How many of each item does she buy? Explain how you found your answer. Paint br

ush=$0.95Paint=$0.75

Mathematics
1 answer:
Lelechka [254]3 years ago
8 0
The complete question in the attached figure

Let 
x-----------------> number of <span>paintbrushes----------- > $0.95 each
y---------------- > number of jar of paint-------------- > $0.99 each

we know that
0.95x+0.99y = </span><span>$4.87
</span><span>
using a graph tool

</span>the solution will be a pair of coordinates that are whole numbers -- > see the attached figure
<span>
the solution is the point (2,3)

x=2---------------------- > </span>number of paintbrushes
y=3---------------------- > number of jar of paint

the answer is
number of paintbrushes=2
number of jar of paint=3<span>

</span>

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The population of a certain country is expected to double every 32 years. The population of this country was 4.2 million people
mojhsa [17]

Answer:

2.2%

Step-by-step explanation:

Given the following :

Population in year 2000 (A) = 4.2 million

Expected population every 32 years = 2 *A

The growth rate per year =?

The population figure after 32 years = (2 * 4.2 million) = 8.4 million

Using the exponential growth formula :

P(t) = A × (1 + r)^t

(1 + r) = g = Total growth percent

A = Initial population

t = time

P(t) = 8.4 million

8,400,000 = 4,200,000 × g^32

g^32 = (8400000/4200000)

g^32 = 2

Taking the root of 32 on both sides

g = 1.02189714865

g = (1 + r)

1.02189714865 = 1 + r

r = 1.02189714865 - 1

r = 0.02189714865

.rate = 0.02189714865 * 100

= 2.18971486541%

= 2.2% ( nearest tenth)

4 0
4 years ago
Calculate the percent.
dimaraw [331]
12%... (3×4)/(25×4) = 12/100... 12/100 = .12 which is 12%
7 0
3 years ago
Exactly how many planes contain points J, K, and N?<br> 0<br> 1<br> 2<br> 3
Archy [21]

Answer:

1

Step-by-step explanation:

JK and KN is perpendicular.

Thus no planes contained them except 1

Which is a rectangle.

I hope this helps you :)

6 0
3 years ago
What is a composite and prime number
Oxana [17]
Prime numbers are numbers that we can only divide by 1 and it self.
example- 2 can only be divided by 2 and 1

composite numbers are numbers we can divide by two or more numbers
example- 4 can be divided by 1,2 and 4.
5 0
3 years ago
Solve the logarithmic equation . Round the answer to four decimal places . 2^x =25
levacccp [35]

Answer:

x = 4.6439

Step-by-step explanation:

2^x =25

Take the log of each side

log  2^x = log 25

We know that log a^b = b log a

x log 2 = log 25

Divide each side by log 2

x = log 25  / log 2

x =4.643856

Rounding to 4 decimal places

x = 4.6439

8 0
3 years ago
Read 2 more answers
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