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Lelu [443]
3 years ago
13

Which expression is equivalent to

Mathematics
1 answer:
VLD [36.1K]3 years ago
8 0

Answer:

28.1x – 3.1

Step-by-step explanation:

1.5(x + 3) + 3.8(7x –2)

Open the parenthesis

= 1.5x + 4.5 + 26.6x - 7.6

Simplify

= 28.1x - 3.1

Therefore, the equivalent expression to 1.5(x + 3) + 3.8(7x –2 is 28.1x - 3.1

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Find the value of x need help asap
oee [108]

Answer:

B

Step-by-step explanation:

In 45 45 90 triangles the ratio is a:a:a root 2 so the answer would be 3root 2/2 or c because when multiplied again by root 2 it will get you 3.

5 0
3 years ago
It takes a plane 3.5 hours to fly 2,345 miles and 2 hours to fly 860 miles
Ilya [14]

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?

  • 550 mph as solved above
3 0
4 years ago
Read 2 more answers
Solve the system of equations using substitution. 3x + 2y = 7 y = –3x + 11
Ilia_Sergeevich [38]
The answer is letter c
3 0
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14x+3y+250. Identify the variables, variable terms, constant terms, and coefficients, as well as what they represent in the cont
rewona [7]
The variables are x and y. The constant is 250. The coefficients are 14 and 3
5 0
3 years ago
If z varies inversely as w and z=40 when w=0.1, find z when w=20
Alex_Xolod [135]
Z varies inversely as w ⇒  z*w=k
z=40 , w=0,1 ⇒40*0,1=4=k

z*20=4
z=4/20=1/5
z=0,2
4 0
3 years ago
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