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3 years ago

Y and x have a proportional relationship, and y = 7 when x = 2. What is the value of x when y = 21?

Mathematics

2 answers:

Sergeu [11.5K]3 years ago

7 0

Hi!
x = 6 bc 7 was multipled by 3 so we would have to multiply 2 also.
Hope this helps!Brainliest?

antiseptic1488 [7]3 years ago

4 0

The answer should be 6 bc the proportion is 3.5 tell me if im wrong...

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Here are the dimensions of the oven tray Jenny bakes the cakes on 600mm by 500mm. Each cake tin is 25 cm in diameter. How many c

storchak [24]

Given:
2 shapes: rectangle (tray) and circle (cake tin)

We need to find the area of each shape.

We need to convert mm to cm. 1mm = 0.1cm
600mm x 0.1cm/1mm = 60cm
500mm x 0.1cm/1mm = 50cm

Area of the Tray = 60cm * 50cm = 3,000cm²

Area of the cake tin = π r²
r = d/2 = 25/2 = 12.5cm

Area of the cake tin = 3.14 * (12.5cm)²
Area of the cake tin = 3.14 * 156.25cm²
Area of the cake tin = 490.625cm²

Area of the tray ÷ Area of the cake tin = number of cake tins that fit
3,000cm² ÷ 490.625cm² = 6.11 or 6 cake tins.

Only 6 cake tins Jenny can fit on the oven tray at one time.

7 0

4 years ago

Drako found an emerald in a cave at a depth between -1/2 and -1 2/3 meters which number could represent the depth which the emer

oksian1 [2.3K]

Answer:

$-\frac{3}{4}$ meters

Step-by-step explanation:

From the answer choices, we basically need to find which of them is between $-\frac{1}{2}$ and $-1\frac{2}{3}$

Converting all of them to decimals would make it really easier:

So we need to find number between -0.5 and -1.67

Answer choice A is -2.33

Answer choice B is -0.75

Answer choice C is -0.25

Answer chioce D is -1.83

So which number, from the choices, is between -0.5 & -1.67?

Clearly, it is -0.75, or, $-\frac{3}{4}$ meters

5 0

4 years ago

Read 2 more answers

Need help with finding the volume of a right triangular prism

dezoksy [38]

Answer:

The volume of the right triangular prism is 55.4 inches³

Step-by-step explanation:

* Lets study the problem

- The triangular prism 5 faces, two triangular base and three

rectangular side faces

- The volume of any prism = Area of its base × its height

- The base of the triangular prism is a triangle

∴ The volume of the triangle prism = Area of the triangle × its height

- In the figure the base is equilateral triangle of side length 4 inches

- The area of the equilateral triangle = √3/4 s², where s is

the length of its side

* we got this area from the rule ⇒ AΔ = (1/2) × s1 × s2 × sinФ,

where Ф is the angle between s1 and s2. In the equilateral Δ

s1 = s2 = s and Ф = 60, then its area = (1/2) × s × s × sin(60),

area of the equilateral Δ = (1/2) × s² × √3/2 = √3/4 s²

∴ The area of the base = √3/4 × (4)² = √3/4 × 16 = 4√3 inches²

* Now we can find the volume of the prism

∵ Area of the base = 4√3 inches²

∵ The length of its height = 8 inches

∵ The volume = area of the base × height

∴ The volume = 4√3 × 8 = 32√3 = 55.4 inches³

* The volume of the right triangular prism is 55.4 inches³

6 0

3 years ago

Write the exponential function f(x)=-4•2^(1-x) in the form f(x)=ab^x

Lerok [7]

-4(2^(1-x)) = -4(2¹ x 2^-x) = -4(2 x ½^x) = -8 (-2)^x therefore the last option

3 0

4 years ago

19.5 -0.72 please help I've been putting off this work for a while

vampirchik [111]

Answer:

18.78

Step-by-step explanation:

Just subtract

4 0

4 years ago

Read 2 more answers