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Marrrta [24]
2 years ago
10

Evaluate the expression when a=-2 and x=7. -2a+x

Mathematics
2 answers:
ziro4ka [17]2 years ago
8 0

Step-by-step explanation:

-2a + x

Putting values of a = - 2 and x = 7

-2(-2) + 7

4 + 7

= 11

natka813 [3]2 years ago
7 0
The answer is 11 bc -2*-2 =4+7=11
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Two cyclist leave towns 75moles apart at the same time and travel towards each other. One cyclist travels 7 mph faster than the
GaryK [48]

Answer:

Step-by-step explanation:

Givens

d1 = d

d2 = 75 - d

r1 = x

r2 = x + 7

t = 3

Equation

x*t + (x + 7)*t = 75

This equation represents the total distance travelled. Neither one of the cyclists have gone 75 miles, but they both have gone distances that equal a total of 75 miles.

Solution

3x + (x + 7)*3 = 75

3x + 3x + 21 = 75

6x + 21 = 75

6x = 54

6x/6 = 54/6

x = 9

Answer

The first cyclist is going 9 miles / hr

The second cyclist is going 16 miles / hour

5 0
2 years ago
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A construction worker needs to put a rectangular window in the side of a building. He knows from measuring that the top and bott
elena-14-01-66 [18.8K]

Answer:

B. 17 ft

Step-by-step explanation:

in a rectangle both diagonals are equally long.

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2 years ago
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mary had $115 to spend on clothes. she found a pair of shoes for $55 and then pants for $15 each. how many pairs of pants can sh
slega [8]

Answer:

She can buy 4 pairs of pants.

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3 years ago
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An airplane flying with the wind can cover a certain distance in 2 hours. The return trip against the wind takes 2.5 hours. Find
Anna [14]

Answer:

Wind speed = 30 mph

Plane speed = 270 mph

Step-by-step explanation:

Given that :

Distance = 600 miles

Let speed of airplane = a ; speed of wind = b

Net speed ; with wind = a + b

Net speed against wind = a - b

Time taken with wind = 2 hours

Time taken against wind = 2.5 hours

Recall :

Speed = distance / time ; distance = speed * time

(a + b) * 2 = (a - b) * 2.5

2a + 2b = 600

a + b = 300 - - - (1)

a = 300 - b

2.5a - 2.5b = 600

a - b = 240 - - - (2)

300 - b - b = 240

300 - 2b = 240

-2b = - 60

b = 30

a = 300 - 30

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Wind speed = 30 mph

Plane speed = 270 mph

4 0
2 years ago
An amusement park charges a $20 admission fee and $3 for each ride. Which equation can be used to determine c, the total cost of
PtichkaEL [24]

Answer:

C = 3n+20

Step-by-step explanation:

C= The Cost

n= the number of rides

So if you get on 2 rides

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and just add in the 20 to get in

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2 years ago
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