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sammy [17]
3 years ago
14

Lisa's penny bank is 1/10 full. After she adds 440 pennies, it is 3/5 full. How many pennies can Lisa's bank hold?

Mathematics
1 answer:
Lisa [10]3 years ago
5 0

First lets change the fractions so they have common denominators:

3/5 = 6/10

The bank was 1/10, after adding the pennies it was 6/10

6/10 - 1/10 = 5/10 = 1/2

This means 400 pennies filled 1/2 the piggy bank.

There are 2 halves (1/2) to a whole ( full piggy bank).

The piggy bank can hold 400 x 2 = 800 pennies.

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If 50 grams of a radioactive substance decomposed to 42 grams in 2 years, then, to the nearest gram, the amount left after 5 yea
Inga [223]

Answer:

30 grams

Step-by-step explanation:

50-42=8

8÷2=4

4=1 year

5×4=20

50-20=30

Hope u can understant

3 0
3 years ago
Help? With this question please
Pie
A. original stuff is for 6 ppl anf u need for 2. and since 2 is 3x less yhan six. divide the ingrefiants by 3.

b. for 15 ppl, 6 is default. dou le all ingtediants is for 12. thrn add 50% more. aka mulyiply all ingrediants by 2.5
6 0
3 years ago
Read 2 more answers
Find the error and then find the correct answer.​
qaws [65]

Answer:

  • w = 3

Step-by-step explanation:

<u>The correct one is given below:</u>

- 5 - 4w = - 17

<u>+5            + 5</u>

     -<u> 4</u>w = <u>-12</u>

      - 4      -4          

        w = 3

The error is 4w instead of - 4w

8 0
2 years ago
How to solve this problem
Stels [109]
Number 7 is 111 because they are alternate interior and 8 is 90
4 0
3 years ago
Find the sum of the first 30 multiples of 8.
Anna11 [10]

Step-by-step explanation:

sum of the arithmetic sequence

a1 = 8

a2 = a1 + 8 = 8+8 = 16

...

an = 8×n

the sum of the first n elements of such a series is

n/2 × (2×a1 + (n - 1)×d]

with d being the difference between 2 consecutive elements (= the added constant).

so,

s30 = 30/2 × (2×8 + 29×8) = 15×(31×8) = 3720

3 0
2 years ago
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