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tatyana61 [14]
3 years ago
15

What is the value of 3ab + 5b-6 when a=-1 and b=3 ?

Mathematics
2 answers:
const2013 [10]3 years ago
5 0

Answer: 3ab + 5b-6 when a=-1 and b=3 ?

Step-by-step explanation:

1st you have to write it out.

3*1*3+5*3-6

Then you need to separate them into 2 different problems

3*1*3=9

5*3-6=9

Lastly, you need to add them both together.

9+9=18

Over [174]3 years ago
5 0

Answer:

3 * -1 x 3   +  5 * 3 - 6 = 0

Step-by-step explanation:

Replace (a)s and (b)s with the given numbers

so (a)s becoming -1 and (b)s becoming 3.

this leads up to the given expression:

3 * -1 x 3   +  5 * 3 - 6

3 times -1 = -3 multiplied by that 3 is -9

since a negative multiplied by a positive is a negative.

With that you have -9 +  5  x 3 - 6

take 5 and 3, multiply them to get 15 and subtract 6.

this ends up with '9'

Lastly ending up with -9+9 = 0

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Ashley can ride her bicycle 15 ml in 2 hours. There are 60 minutes in 1 hour and there are 1,760 in 1 mile. How many yards does
bearhunter [10]

Answer:

220 Yards per minute

Step-by-step explanation:

15miles/2hours

**To show mph**

7.5miles/1hour ; Now you want to convert the miles into yards and the hours into minutes.

7.5*1,760/60minutes

13200/60 minutes ; now divide to show yards per minute.

220ypm


4 0
3 years ago
A tennis instructor chargers $40 for each one hour lesson and $25 for each half hour lesson if the instructors I come from 35 le
kaheart [24]
X = 1 hr lessons and y = 1/2 hr lessons

x + y = 35......y = 35 - x
40x + 25y = 1115

40x + 25(35 - x) = 1115
40x + 875 - 25x = 1115
40x - 25x = 1115 - 875
15x = 240
x = 240/15
x = 16 <=== there are 16 one-hr lessons
and 19 half-hr lessons
7 0
3 years ago
Sheila is going to divide a 38-inch piece of ribbon into 5 equal pieces. She says each piece
DENIUS [597]

Sheila is incorrect! I think what she did is think the 38 was actually a 35, which WOULD of made her statement true, but since it's 38, she's very incorrect. Sheila should be using the quotient for the size of each piece. 38 divided by 5 is 7.6. The correct answer is 7.6 inches.

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3 years ago
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Answer:

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Step-by-step explanation:

It's an Irregular polygon

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let -5 represent the changes in gas every hour.Which expression represents th etotal change in gas after 6 hours
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Answer:

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After six hours the changes in gas were -30

Step-by-step explanation:

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