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2 years ago

Could yall help please

Mathematics

1 answer:

ser-zykov [4K]2 years ago

6 0

Answer:

Step-by-step explanation:

As you know, 390% is 3.9. You multiply 3.9*30 and get 117 or something. That rounds to about 120, so C.

I hoped that helped

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I will give 50 points and brainliest amd whatever u want pls its urgent PLS

frez [133]

Answer:

The answer to your question is 24 cm³

Step-by-step explanation:

Data

Initial volume = 2/5

Additional volume = 42 cm³

Final volume = 4/7

the total volume of the glass = ?

Process

1.- Write a proportion to help you solve the problem

42 cm³ -------------------- 4/7 of the total

x ------------------- 7/7

2.- Solve the proportion

x = (7/7 x 42) / 4/7

3.- Simplification

x = 42 / 4/7

x = 168/7

x = 24 cm³

3 0

2 years ago

Alexis bought a pyramid-like paperweight for her teacher. The paperweight has a volume of 200 cm3 and a density of 1.5 grams per

Nikolay [14]

Answer:

The density is equal to the weight divided by the volume:

$\rho=\dfrac{W}{V}$

The paperweight weights 300 grams.

Step-by-step explanation:

The density of the paperweight can be calculated knowing the weight and the volume of this paperweight.

The density is equal to the weight divided by the volume:

$\rho=\dfrac{W}{V}$

We know that the density of this paperweight is 1.5 grams per cm3, and its volume is 200 cm3.

We can use the formula of the density to calculate the weight:

$\rho=\dfrac{W}{V}\\\\\\W=\rho\cdot V=1.5\;\dfrac{g}{cm^3}\,\cdot\;200\; cm^3\\\\\\W=300\;g$

The paperweight weights 300 grams.

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