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aliya0001 [1]
2 years ago
8

3×-7 equivalent expressions A. -21 B. 4 C. -4 D. 21

Mathematics
1 answer:
USPshnik [31]2 years ago
6 0

Answer:

-21

Step-by-step explanation:

3x7=21 and a negative x a positive is always negative

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A cylinder has a volume of 90pi and a radius of 3. what is the height?
kykrilka [37]

Step-by-step explanation:

  • volume of cylinder=90π
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8 0
2 years ago
Team tool bella canoed 15 3/4 miles in 5/4 hours. What was their average rate of speed in mph ​
luda_lava [24]

Average speed is 12.6 miles per hour

<em><u>Solution:</u></em>

Given that team tool bella canoed 15\frac{3}{4} miles in \frac{5}{4} hours

To find: average rate of speed in miles per hour

From given information,

distance = 15\frac{3}{4} \text{ miles } = \frac{15 \times 4+3}{4} = \frac{63}{4} \text{ miles}

time = \frac{5}{4} \text{ hours}

To find the speed we use the below formula,

speed = \frac{distance}{time}

Substituting the given values we get,

speed = \frac{\frac{63}{4}}{\frac{5}{4}}\\\\speed = \frac{63}{4} \times \frac{4}{5} = \frac{63}{5} = 12.6

Thus average speed is 12.6 miles per hour

7 0
3 years ago
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vovikov84 [41]

Answer:

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Step-by-step explanation:

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6 0
3 years ago
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 If 2.5 pounds of a  certain grain cost $1.75, how much will 5.3 pounds of the grain cost? a. $4.79 b. $4.38 c. $3.62 d. $3.71  
melisa1 [442]
 2.5 pounds of grain cost ======= $1.75
∴ 5.3 pounds of grain will cost ===== (5.3×1.75)/2.5 = $3.71 
7 0
3 years ago
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15, 16, 20, and 22! PLEASE HELP
Vikentia [17]
The answer for number 16 is 20
7 0
3 years ago
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