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Anestetic [448]
3 years ago
6

Pls help...................

Mathematics
1 answer:
bearhunter [10]3 years ago
5 0
First one b ≤ 9 good luck
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Element X is a radioactive isotope such that every 13 years, its mass decreases by half. Given that the initial mass of a sample
Nana76 [90]

Answer:

2,325 grams !

Step-by-step explanation:

8 0
2 years ago
Solve the proportion. I need to show much work so a step by step explanation would help!
kkurt [141]

Answer:

<em>Solution: x=5</em>

Step-by-step explanation:

<u>Equations</u>

This is an equation in the form of a proportion or ratio:

\displaystyle \frac{2}{x+3}=\frac{5}{4x}

To solve it, we eliminate the denominators by multiplying by both of them.

Multiply by (x+3)(4x):

\displaystyle (x+3)(4x)\frac{2}{x+3}=(x+3)(4x)\frac{5}{4x}

Simplify both sides:

(4x)*2=(x+3)*5

Operate:

8x=5x+15

Simplify:

3x=15

Solve for x:

x=15/3=5

Solution: x=5

5 0
3 years ago
Construct a trapezium ABCD such that AD is parallel to BC, AB = 4.8 cm, BC = 6.8 cm, CD = 5.4 cm and ∠ABC = 60°. Measure and wri
lara31 [8.8K]

Answer:

AC = 6.05 cm

Step-by-step explanation:

We can draw two different trapeziums with the information given.

The possible drawings of the trapezium ABCD are in the image attached.

In both trapeziums, the length of AC is the same, and we can calculate this length using the law of cosines in the triangle ABC:

AC^2 = AB^2 + BC^2 - 2 * AB * BC * cos(B)

AC^2 = 4.8^2 + 6.8^2 - 2 * 4.8 * 6.8 * cos(60)

AC^2 = 23.04 + 46.24 - 65.28 * 0.5

AC^2 = 36.64

AC = 6.05 cm

5 0
3 years ago
From two points on the same level as the base of a tree, the angles of elevation to the top of the tree are found to be 24° and
Valentin [98]

Answer:

the answer is 32.8in.

Step-by-step explanation:

(sin 22)/42 = (sin 24)/x

x = 45.60

sin 46 = x/45.60

x = 32.80

32.8in.

hope it helped :)

mark me brainliest!

8 0
2 years ago
A-plus Auto Body is painting designs on a customers car. They had 18pints of blue paint on hand. They used 1/2 of it for the fla
Mashutka [201]
1/2 of 18 pints is 9 because 18/2=9

They have 9 pints left.

1/3 of 18 pints is 6 because 1/3*18=6

9-6=3

There are 3 pints left.

They need 7.75 pints and they only have 3 so 7.75-3=4.75 (or 4 3/4)

They need 4 3/4 more pints of blue paint
7 0
2 years ago
Read 2 more answers
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