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Masteriza [31]
3 years ago
14

Crystal's sister Melanie is 3 years older than twice her age. Write an algebraic expression that represents the relationship of

Melanie's age in therms of crystal's age, c.
Mathematics
1 answer:
maksim [4K]3 years ago
4 0

Answer:

M=3+2C

Step-by-step explanation:

Let M be Melanie's age

Let C be Crystal's age

Twice Crystal's age =2C

3 years more than twice crystal's age =3+2C

Therefore, the expression would be ;

M=3 +2C

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It takes a plane 3.5 hours to fly 2,345 miles and 2 hours to fly 860 miles
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Answer:

See below

Step-by-step explanation:

a. How fast does the plane fly during the first leg of the trip?

  • 2345/3.5 = 670 mph

b. How fast does the plane fly during the last leg of the trip?

  • 860/2 = 430 mph

c. What system of equations might be helpful in this scenario?

<u>s - speed of the plane, w - speed of the wind, equations:</u>

  • s + w = 670
  • s - w = 430

d. Solve this system of equations using the best method.

Add the equation together to get:

  • 2s = 1100 ⇒ s = 550 mph
  • w = 550 - 430 = 120 mph

e. How fast is the wind?

  • 120 mph as solved above

f. How fast does the plane fly without any wind?

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3 0
3 years ago
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Oksanka [162]
<span>sediments melt deep beneath earth’s surface.</span>
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MIDDLE SCHOOL MATH DONT ANSWER IF YOU DONT KNO-<br> WILL GIVE BRAINLIEST
Juli2301 [7.4K]

Answer:

Radius is <u>2.8</u> Circumference is <u>17.584 or 17.6 Rounded to the nearest Tenths </u>

Step-by-step explanation:

1. Find circumference with the Formula <u>C=πd</u>

C=3.14 x 5.6

<u><em>C=17.584 or 17.6 Rounded to the nearest Tenths </em></u>

2. Radius is Always half of the Diameter.

5.6/2 = 2.8

<em><u>2.8 is your radius.</u></em>

3. If you want to check you work try the formula C=2πr to see if things checks out.

C=2 x 3.14 x 2.8

<u><em>C= 17.584 or 17.6 Rounded to the nearest Tenths </em></u>

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<u><em>Hope this Helps!</em></u>

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Answer:

a = 9 \frac{1}{3}

Step-by-step explanation:

2a - 5 = 5a + 23 \\ 2a - 5a = 23 + 5 \\  - 3a = 28 \\  \frac{ - 3a}{ - 3}  =  \frac{28}{ - 3}  \\ a = 9 \frac{1}{3}

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