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3 years ago

50% of what value is 30

Mathematics

2 answers:

notsponge [240]3 years ago

8 0

Answer:

the value is 60

Step-by-step explanation:

Hello, i think I can help you with this.

to solve this you can use a simple rule of three

Step 1

if 50% is 30, how much is the 100%?

50% ⇒ 30

100%⇒ x?

the relation is

$\frac{50}{30}=\frac{100}{x}\\isolate\ x\\\frac{x*50}{30}=100\\x*50=100*30\\50x=3000\\x=\frac{3000}{50} \\x=60$

Do not hesitate to ask me any questions about it.

Have a fantastic day.

Zina [86]3 years ago

3 0

Answer:

Step-by-step explanation:

50% is like saying half, and 30 is half of 60

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(r, 7), (11, 8), m = -1/5

soldier1979 [14.2K]

Answer:

The value of r is 16

Step-by-step explanation:

The correct question is

Find out the value of r if the slope between the two ordered pairs is m=-1/5

we know that

The formula to calculate the slope between two points is equal to

$m=\frac{y2-y1}{x2-x1}$

we have the points

(r, 7), (11, 8)

substitute the values

$m=\frac{8-7}{11-r}$

$m=\frac{1}{11-r}$

Remember that

$m=-\frac{1}{5}$

equate the equations

$\frac{1}{11-r}=-\frac{1}{5}$

solve for r

Multiply in cross

$-(11-r)=5\\r-11=5\\r=11+5\\r=16$

4 0

3 years ago

How many 6” x 4” x 2” bricks will you need to construct a 14’5” x 5’5” x 0.5’ wall?

IRISSAK [1]

Answer:

1406 bricks

Step-by-step explanation:

We are given that the dimension of the bricks are,

Length = 6 inches, Width = 4 inches and Height = 2 inches.

Thus, we have,

Volume of 1 brick, $V_{B}$ = Length × Width × Height

i.e. Volume of 1 brick, $V_{B}$ = 6 × 4 × 2 = 48 inch²

So, the volume of 1 brick is 48 inch².

Also, the dimensions of the wall are given by,

Length = 14’5” = 173 inches, Width = 5’5” = 65 inches and Height = 0.5' = 6 inches

Volume of the wall, $V_{W}$ = Length × Width × Height

i.e. Volume of the wall, $V_{W}$ = 173 × 65 × 6 = 67470 inch²

So, the volume of the wall is 67470 inch².

Thus, we get,

Number of bricks = $\frac{V_{W}}{V_{B}}$

i.e. Number of bricks = $\frac{67470}{48}$

i.e. Number of bricks = 1406

Hence, 1406 bricks are needed to construct the wall.

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3 years ago

A tree with a height of 4 ft casts a shadow 15ft long on the ground how tall is another tree that cast a shadow which is 20ft lo

wariber [46]

Height of another tree that cast a shadow which is 20ft long is 5 feet approximately

<h3>Solution:</h3>

Given that tree with a height of 4 ft casts a shadow 15ft long on the ground

Another tree that cast a shadow which is 20ft long

To find: height of another tree

We can solve this by setting up a ratio comparing the height of the tree to the height of the another tree and shadow of the tree to the shadow of the another tree

$\frac{\text {height of tree}}{\text {length of shadow}}$

Let us assume,

Height of tree = $H_t = 4 feet$

Length of shadow of tree = $L_t = 15 feet$

Height of another tree = $H_a$

Length of shadow of another tree = $L_a = 20 feet$

Set up a proportion comparing the height of each object to the length of the shadow,

$\frac{\text {height of tree}}{\text {length of shadow of tree}}=\frac{\text { height of another tree }}{\text { length of shadow of another tree }}$

$\frac{H_{t}}{L_{t}}=\frac{H_{a}}{L_{a}}$

Substituting the values we get,

$\frac{4}{15} = \frac{H_a}{20}\\\\H_a = \frac{4}{15} \times 20\\\\H_a = 5.33$

So the height of another tree is 5 feet approximately

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3 years ago

Svetlana's hair is 4 centimeters long. Her hair grows 1.5, point, 5 centimeters per month. Svetlana wants her hair to grow so th

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