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qaws [65]
3 years ago
9

Help me plzzzz and tyyyy

Mathematics
1 answer:
marin [14]3 years ago
5 0

Answer:

her language arts hw takes longer and it takes 2/9 hr longer

Step-by-step explanation:

first of all, 4/9 > 2/9

4/9-2/9=2/9

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The half-life of a radioactive isotope is 10 years. About how long would it take 5 grams of the isotope to decay until there wer
valkas [14]

Answer:

Option A. 10 years

Step-by-step explanation:

we know that

Half-life (t^{\frac{1}{2}}) is the amount of time required for a quantity to fall to half its value as measured at the beginning of the time period.

In this problem  (t^{\frac{1}{2}}) of a radioactive isotope is 10 years, which means that after 10 years half of the sample would have decayed and half would be left as it is.

After 10 years ( first half life) 5/2 = 2.5 g decays and 2.5 g remains left

8 0
3 years ago
Tom has twice as many marbles as luke together they have 39 marbles how many marbles does luke have?
Nookie1986 [14]

Answer:

Luke has 13 marbles

Step-by-step explanation:

t = number of marbles Tom has

l = number of marbles Luke has

t = 2l

t+l = 39

Substitute t = 2l into the second equation

2l + l = 39

Combine like terms

3l = 39

Divide by 3

3l /3 = 39/3

l = 13

Luke has 13 marbles

Tom has 2 * 13 = 26 marbles

4 0
4 years ago
Write the equation of the line through (5, -4); m = 1
Snowcat [4.5K]
(0+4) = 1(5-0)
point slope form
4 0
3 years ago
Read 2 more answers
The volume of a cuboid is 675cm3. The length is 15cm and the width is 30mm. Work out the height of the cuboid in cm.
WITCHER [35]

Answer:

Step-by-step explanation:

30 mm = 3 cm

\\ height=\frac{Volume}{length*width}\\\\=\frac{675}{15*3}\\\\=15 cm

7 0
3 years ago
Read 2 more answers
What is the volume of a cube that has a side of 4 units?
ira [324]

Answer: 64units³

Step-by-step explanation:

The volume of a cube will be gotten by multiplying the value of its side thrice. This means that for example if the cube has a side of xcm, the volume will be:

= x × x × x

= x³

In this case, since the cube has a side of 4 units, the volume will be:

Volume of cube = 4³

Volume of cube = 4 × 4 × 4 = 64unit³

4 0
3 years ago
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