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noname [10]
3 years ago
15

Which expressions are equivalent to 16x4 − 64? Check all that apply.

Mathematics
2 answers:
Cerrena [4.2K]3 years ago
8 0

Answer:

First, Third, and Fourth to be short

Step-by-step explanation:

he basically explained everything else

Dmitry_Shevchenko [17]3 years ago
7 0
The first one is one, because 16x and -16x cancel eachother out, the second one on the other hand is not because 2 negatives do not cancel each other, but instead, add together. the third one yes, because when you foil 4x2 times 4x2 = 16x4. the -8 x 4x2 and 8 x 4x2 cancel eachother out, leaving you with -8 x 8, which equals -64, thus 16x4 - 64. the 4th one yes, because 16x2 x x2 = 16x4, and 16 x 2 = 32, x -2 equals -64.the last one, no because while 4 x 4x4 IS 16x4, 4 x -8 is 32 
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Two mechanics worked on a car. The first mechanic worked for hours, and the second mechanic worked for hours. Together they char
AleksAgata [21]

Answer:

The rate charged by first mechanic per hour= x =$85

The rat charged by second mechanic per hour =y = $70

Step-by-step explanation:

Two mechanics worked on a car. The first mechanic worked for 10 hours, and the second mechanic worked for 15 hours. Together they charged a total of $1900. What was the rate charged per hour by each mechanic if the sum of the two rates was $155 per hour?

Solution

Let

x= hourly rate of the first mechanic

y= hourly rate of the second mechanic

Derive two equations to solve for the two unknowns

10x + 15y = 1900 (1)

x + y = 155 (2)

From (2)

x + y = 155

x=155-y

Substitute x=155-y into (1)

10x + 15y = 1900

10(155-y) + 15y =1900

1550 -10y + 15y =1900

5y =1900-1550

5y=350

Divide both sides by 5

y= 70

Substitute y=70 into (2)

x + y = 155

x + (70) =155

x=155 - 70

= 85

x= 85

The rate charged by first mechanic per hour= x =$85

The rat charged by second mechanic per hour =y = $70

8 0
3 years ago
Zeus Industries bought a computer for $2754. It is expected to depreciate at a rate of 27% per year. What will the value of the
valentinak56 [21]
Answer is $782.10
1st year —2754 ÷ 0.27 = 743.58         2754 – 743.58 = 2010.42 
2nd year— 2010.42 ÷ 0.27 = 542.81   2010.42 – 542.81 = 1467.61 
3rd year — 1467.61 ÷ 0.27 = 396.25   1467.61 – 396.25 = 1071.36 
4th year — 1071.36 ÷ 0.27 = 289.26   1071.36 – 289.26 = 782.10
8 0
3 years ago
Read 2 more answers
I am 80 units away from -2 where am I
dlinn [17]

Answer:

78 or -82

Step-by-step explanation:

-2+80=78

-2-80=-82

7 0
3 years ago
1. A motorboat leaves a harbor and travels at an average speed of 15 mph toward an island. The average speed on the return trip
jenyasd209 [6]

Answer:

  30 miles

Step-by-step explanation:

Let d represent the distance to the island. The relation between time, speed, and distance is ...

  time = distance/speed

so the total time for the round trip is ...

  d/15 +d/10 = 5

Multiplying by 30, we get

  2d +3d = 150

  d = 150/5 = 30

The island was 30 miles from the harbor.

5 0
3 years ago
F(x) = 2x - 3 for f(0).
Dafna11 [192]
Answer: -3
f(0)=2•0-3
f(x)=-3
6 0
3 years ago
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