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Travka [436]
3 years ago
7

Evaluate 14 - 2xy when x = -6 and y = 2.

Mathematics
2 answers:
valkas [14]3 years ago
8 0

Answer: 38

Step-by-step explanation:

14 - 2xy

(substitute x and y)

14 - 2 (-6) (2)

14 + 24

38

jasenka [17]3 years ago
7 0

Answer:

its 38

Step-by-step explanation:

Do xy first and you get -24 and 14-(-28) would be a double negative so you add them together.

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The sum of 10 and a number y is equal to 18
lora16 [44]
  10 + y = 18
- 10        - 10
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3 years ago
Teresa purchased a prepaid phone card for $15 . Long distance calls cost 24 cents a minute using this card. Teresa used her card
yan [13]

Answer:

46 minutes

Step-by-step explanation:

Teresa purchased a prepaid phone for $15

Long distance calls cost 24 cents a minute using this card

She used the card just once to make a long distance call

The remaining credit on her card was $3.96

Therefore the minutes in which her call lasted can be calculated as follows

Let x represent the minutes

15 - 24/100x= 3.96

15-0.24x= 3.96

-0.24x= 3.96-15

-0.24x= -11.04

x= 11.04/0.24

x = 46

Hence Teresa call lasted for 46 minutes

4 0
4 years ago
Caroline has a collection of 280 coins. How many coins represent 5% of her collection?
Nataly [62]

Answer:

14 coins

Step-by-step explanation:

280 * 0.05 = 14

5 0
3 years ago
The units’ digit of a two-digit number is 5 more than the tens’ digit, and the number is three times as great as the sum of the
solniwko [45]

Answer:

The number is 27

Step-by-step explanation:

Let the 10s digit be x

Let the units digit be y

y = x + 5

10x + y = 3(x + y)                  Remove the brackets          

10x + y = 3x + 3y                 Substitute the x + 5 into the second equation for y

10x + x + 5 = 3x + 3(x + 5)   Remove the brackets on the right.

10x + x + 5 = 3x + 3x +15     Collect like terms on each side.

11x + 5 = 6x + 15                   Subtract 5 from both sides

11x + 5 - 5 = 6x + 15 - 5        Collect like terms

11x = 6x + 10                         Subtract 6x from both sides

11x - 6x = 6x - 6x + 10

5x =  10                                 Divide by 5

5x/5 = 10/5

x = 2

y = x + 5

y = 2 + 5

y = 7

3 0
3 years ago
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