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3 years ago

Anissa gets 5 dollars each week she saves one dollar of her allowance what percent of her allowance does she save

Mathematics

1 answer:

Anon25 [30]3 years ago

3 0

Answer: 20%

Step-by-step explanation: if you set up a proportion 1/5 = x/100 (1/5 is the allowance she saves out of the amount she earns, and x/100 is the proportion for a %). Cross multiply. 100=5x, then solve the equation. 100/5 is 20. Therefore 1/5 is 20%.

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The area of a rectangle is 4.9 square units. The length is 2.5 units and the width is y units. What is the value of y?

iris [78.8K]

1.96, if you multiply that by the length, (which is 2.5) then you will get the area of 4.9 hope this helps

4 0

2 years ago

Read 2 more answers

A sphere and a cylinder have the same radius and height. The volume of the cylinder is 21 meters cubed. A sphere with height h a

8090 [49]

Answer:

C. 14 metres cubed

Step-by-step explanation:

The volume of a sphere is denoted by: $V=\frac{4}{3} \pi r^3$ , where r is the radius, while the volume of a cylinder is denoted by: $V=\pi r^2h$ , where r is the radius and h is the height.

Here, we know that the sphere and cylinder have the same radius and height. However, the "height" of the sphere is technically just the diameter, which is twice the radius. So, h = 2r. We know the volume of the cylinder is 21, so:

$V=\pi r^2h=\pi r^2*2r=2\pi r^3$

$21=2\pi r^3$

πr³ = 21/2 = 10.5

Now plug this into the volume of a sphere formula:

$V=\frac{4}{3} \pi r^3$

$V=\frac{4}{3} *10.5=14$

The answer is C, 14 metres cubed.

5 0

3 years ago

Read 2 more answers

A helicopter hovers at an altitude that is 1000 feet above a mountain of altitude 5210 feet. A second, taller peak is viewed fro

ehidna [41]

Given:

Height of Mountain A = 5210 feet
Distance of Mountain A from a helicopter above the peak = 1000 feet
Angle of depression:
Mountain B to helicopter = 43 degrees
Mountain B to Mountain A = 19 degrees

First, draw an illustration and label the enumerated given values.

Observe that there are two right triangles formed:

From the triangle formed by the helicopter and Mountain B,

let x = total height of mountain B
y = leg of first triangle (helicopter and mountain b)
h = hypotenuse
Use the Pythagorean Theorem:

cos (43) = y / h

From the second triangle formed by mountain b and a,

cos (19) = (1000 + y) / h

solve for h and y

then, solve for the height of Mountain B:

x = 1000 + y + 5210

6 0

3 years ago

In the figure below, GRAH is a rectangle, RA=7, and GA=10. Determine AH.

svetoff [14.1K]

Answer:

AH = $\sqrt{51}$

Step-by-step explanation:

The opposite sides of a rectangle are congruent , so

GH = RA = 7

Using Pythagoras' identity in right Δ GHA

AH² + GH² = GA²

AH² + 7² = 10²

AH² + 49 = 100 ( subtract 49 from both sides )

AH² = 51 ( take the square root of both sides )

AH = $\sqrt{51}$ ≈ 7.14 ( to 2 dec. places )

3 0

3 years ago

Can someone help with this please? Thanks

ANTONII [103]

Help you with what???

3 0

3 years ago