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3 years ago

What is a simplified form of the expression 7x – 5(x + 1)?

Mathematics

2 answers:

Viefleur [7K]3 years ago

4 0

2x-5 - answer

i hope this helps

Maru [420]3 years ago

3 0

Answer:2.5

Step-by-step explanation:

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PLEASE HELP! URGENT! WILL GIVE BRAINLIEST!

alexandr402 [8]

1. The answer is 1. To get this answer, substitute x=3 into the function and solve for f(x)

2. The answer is 12. Substitute -5 in place for f(x) and isolate and solve for x.

**Please mark this answer as Brainliest and leave a Thanks if I helped :)

5 0

3 years ago

An airliner maintaining a constant elevation of 2 miles passes over an airport at noon traveling 500 mi/hr due west. At 1:00 PM,

butalik [34]

Answer:

$\frac{ds}{dt}\approx 743.303\,\frac{mi}{h}$

Step-by-step explanation:

Let suppose that airliners travel at constant speed. The equations for travelled distance of each airplane with respect to origin are respectively:

First airplane

$r_{A} = 500\,\frac{mi}{h}\cdot t\\r_{B} = 550\,\frac{mi}{h}\cdot t$

Where t is the time measured in hours.

Since north and west are perpendicular to each other, the staight distance between airliners can modelled by means of the Pythagorean Theorem:

$s=\sqrt{r_{A}^{2}+r_{B}^{2}}$

Rate of change of such distance can be found by the deriving the expression in terms of time:

$\frac{ds}{dt}=\frac{r_{A}\cdot \frac{dr_{A}}{dt}+r_{B}\cdot \frac{dr_{B}}{dt}}{\sqrt{r_{A}^{2}+r_{B}^{2}} }$

Where $\frac{dr_{A}}{dt} = 500\,\frac{mi}{h}$ and $\frac{dr_{B}}{dt} = 550\,\frac{mi}{h}$ , respectively. Distances of each airliner at 2:30 PM are:

$r_{A}= (500\,\frac{mi}{h})\cdot (1.5\,h)\\r_{A} = 750\,mi$

$r_{B}=(550\,\frac{mi}{h} )\cdot (1.5\,h)\\r_{B} = 825\,mi$

The rate of change is:

$\frac{ds}{dt}=\frac{(750\,mi)\cdot (500\,\frac{mi}{h} )+(825\,mi)\cdot(550\,\frac{mi}{h})}{\sqrt{(750\,mi)^{2}+(825\,mi)^{2}} }$

$\frac{ds}{dt}\approx 743.303\,\frac{mi}{h}$

6 0

3 years ago

What is the area of 3.14 x 20

7nadin3 [17]

Answer:

62.8

Step-by-step explanation:

6 0

3 years ago

Read 2 more answers

explain how multiplying a whole number and a decimal is similar to and different from multiplying whole numbers

Mrac [35]

It's similar because u still with have an answer weather its a decimal or not. And it's different because when your multiplying whole number u will just get whole numbers.

6 0

3 years ago

Which expression is equivalent to r^m ÷ r^n?

Andre45 [30]

R^m ÷ r^n is equal to r^(m-n).

For example, 2^5 <span>÷ 2^3 = 2^2.
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Is that what you mean?

7 0

3 years ago