what expression can be used to find the total discount of a radio that costs $42.00 and has a 30% off sign.

Answers

Answer 1

Answer: The answer is
(42 times 30) divided by 100

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What is the greatest factor of 52 that is a prime number?

Answers

Factors of 52 = 1, 2, 4, 13, 26, 52.

The greatest factor of 52 that is a prime number is 13.

A bank teller has 7 rolls of coins. each roll has 40 coins. how many does the bank teller have?

Answers

well if you have a calculator then you can do this watch:... so with the calculator do 40 times 7 then hit = and that will give you then answer but i want to help you
so...
40 * 7 = 280
So that means the bank tell has a total of 280 coins with him

You do 40 x 7 which is 280

A pair of inline skates, regularly priced at $180, is now on sale at a 30% discount. What is the sale price of the skates?

Answers

180 x (1-30%)
=180 x 0.7
=$126

so you divide it by 10 to get $18 (10%)
Then you do 18*3 = 54 (This is 30%)
Then you minus this from $180: 180-54= $126

Jim, Carla and Tommy are members of the same family. Carla is 5 years older than Jim. Tommy is 6 years older than Carla. The sum of their three ages is 31 years. How old is each one them?

Answers

So,

We'll solve it with only one placeholder, since that's simpler.

Jim's age = J
Carla's age = C
Tommy's age = T

J = base
Carla's age = J + 5
Tommy's age = Carla's age + 6 or J + 5 + 6 or J + 11

Sum of ages = 31
(J) + (J + 5) + (J + 11) = 31

3J + 16 = 31

Subtract 16 from both sides
3J = 15

Divide both sides by 3
J = 5

Carla's age = J + 5
Carla's age = 10

Tommy's age = Carla's age + 6
Tommy's age = 10 + 6 or 16

5 + 10 + 16 = 31
15 + 16 = 31
31 = 31 This checks.

Jim is 5.
Carla is 10.
Tommy is 16.

lets
Jim x years old
Carla (x+5) years old
Tommy (x+5)+6 years old
sum is x+(x+5)+(x+5)+6=31 years old
3x+16=31
3x=15
x=5 - age of Jim
x+5=5+5=10 - age of Carla
x+5+6=16 - age of Tommy
Answer: 5, 10 and 16 y.o

How much is 300 pennies

Answers

It would be five dollars

Answer:

$3.00

Step-by-step explanation:

100 pennies in a dollar

so 300 pennies in $3

What is -2x-7=3(4x+7)

Answers

Answer:

x= -2

Step-by-step explanation:

sorry dont read this

Answer:

x= -2

Step-by-step explanation:

-2x-7=3(4x+7)

multiply numbers in parenthesis by 3

-2x-7=12x+21

move terms

-2x-12x=21+7

subtract -2x to -12x but since there negative the equation is addition. Also, add 21 to 7

-14x=28

divide both sides by -14

x= -2

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