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miv72 [106K]
3 years ago
15

Write an equation for the description. the sum of 17 and a number x is equal to 21

Mathematics
2 answers:
pychu [463]3 years ago
8 0
<h2><u>Answer:</u></h2><h3>17+x = 21</h3><h3 /><h3>(i did the math assignment)  </h3>

lawyer [7]3 years ago
7 0

Answer:

Equation: 17+x=21

btw x=4

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On a map, the scale shown is 1 inch: 20 miles. If a city is 900 square miles, what is the area of the city on the map?
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Answer:

2.25 square inches

Step-by-step explanation:

we know that

The scale is 1\ inch: 20\ miles

That means

1 inch on a map represent 20 miles in the city

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Applying proportion

\frac{1}{400}\ \frac{in^2}{mi^2}=\frac{x}{900}\ \frac{in^2}{mi^2}\\\\x=900/400\\\\x=2.25\ in^2

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3 years ago
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4a. 7.2

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6 0
2 years ago
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A bacteria colony increases in size at a rate of 4.0581e1.6t bacteria per hour. If the initial population is 36 bacteria, find t
Harrizon [31]

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Step-by-step explanation:

The rate of Increase of the population (P) of the bacteria is given as:

\frac{dP}{dt} =4.058e^{1.6t}

dP =4.058e^{1.6t}}dt\\Taking\: Integrals\\\int dP =4.058 \int e^{1.6t}dt\\P(t)=\frac{4.058}{1.6} (e^{1.6t} +K)\\P(t)=2.53625 (e^{1.6t} +K)

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At t=0, P(t)=36

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Therefore:

P(t)=2.53625 (e^{1.6t} +13.19)\\At \: t=4\\P(4)=2.53625 (e^{1.6*4} +13.19)\\=1559.88\\P(4)=1560

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3 years ago
A car is traveling at a constant speed of M miles per hour. Which coordinate is
lbvjy [14]

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