All Questions ⁺⁰237827 Questions

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Question on rectangle

A 3×23 rectangle stands so that its sides of length 23 are vertical. How many ways are there of tiling this 3×23 rectangle with 1×3tiles, of which exactly 6 are vertical?

Natalya2907 Jul 4, 2023

0

135

5

+70

idk help

Line a is parallel to line b and goes through the point (1,2). Line b goes through the point (3,1) and is perpendicular to line c whose equation is y=-2x+3. Find the y-intercept of line a.

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sheeshers Jul 4, 2023

Jul 3, 2023

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146

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system

plz help with systems
For certain values of k and m, the system
3a + 2b = 2
6a + 2b = k + 3a + mb read more ..

Guest Jul 3, 2023

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131

4

help please

All members of our painting team paint at the same rate. If 20 members can paint a 2000 square foot wall in 35 minutes, then how long would it take the members to paint a 5000 square foot wall, in minutes?<read more ..

Guest Jul 3, 2023

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138

5

please help

(a) Sam writes down the numbers 1,2, ... , 999. How many digits did Sam write, in total?
(b) Sam writes down the numbers 1,2, ... , 999. Sam chooses one of the digits written down at random. What is the probability that Sam chooses read more ..

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Guest Jul 3, 2023

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136

0

help plz!

Find all values of x such that \sqrt{4x^2} + \sqrt{x^2} = 6 + 3x.

Guest Jul 3, 2023

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107

2

help please!!!

I drove to the beach at a rate of 40 miles per hour. If I had driven at a rate of 25 miles per hour instead, then I would have arrived 45 minutes later. How many miles did I drive

Guest Jul 3, 2023

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139

1

system

Find the ordered triple (p,q,r) that satisfies the following system:
p - 2q = 3
q - 2r = -2 + q
p + r = 9 + p read more ..

Guest Jul 3, 2023

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133

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ellipse

The foci of an ellipse are at $(2, -3 + \sqrt{5})$ and $(4,-8).$ If the ellipse is tangent to both the $x$-axis and $y$-axis, then find the length of the major axis.

Guest Jul 3, 2023

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150

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ellipse

The equation of an ellipse is
x^2/a^2 + y^2/b^2 = 1
A circle is drawn so that it is contained in the ellipse, its center lies on the x-axis, and it touches the ellipse only at the point (a,0). If a = b = 5, find the radius of the circl read more ..

Guest Jul 3, 2023

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134

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sum

For any positive integer n, let f(n) = 4n/(sqrt(2n + 1) + sqrt(2n - 1)) find the sum of f(1)+f(2)+...+ f(40)

Guest Jul 3, 2023

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128

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ellipse

The foci of an ellipse are at F_1=(0,2) and F_2=(2,0). The ellipse passes through the origin, and intersects the x-axis at one other point. What is this point of intersection?

Guest Jul 3, 2023

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126

3

Geometry pls help

Find the volume of a rectangular solid if the areas of three of its adjacent faces are 12, 8, 6
Please explain ur answer too

Guest Jul 3, 2023

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136

1

rates

I drove to the beach at a rate of 40 miles per hour. If I had driven at a rate of 50 miles per hour instead, then I would have arrived 45 minutes later. How many miles did I drive?

Guest Jul 3, 2023

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157

2

URGENT!!! please someone answer quickly!

In triangle ABC, angle A = 30° and angle B = 60°. Point X is on side AC such that line segment BX bisects angle ABC. If the length of side AC = 12, then find the area of triangle BXA.

Guest Jul 3, 2023

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135

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rates

A plane flies from Penthaven to Jackson and then back to Penthaven. When there is no wind, the round trip takes 3 hours and 36 minutes, but when there is a wind blowing from Penthaven to Jackson at 20 miles per hour, the trip takes read more ..

Guest Jul 3, 2023

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140

0

ellipse

An ellipse has the following properties:
It is tangent to the $x$-axis at $(4,0).$
It is tangent to the $y$-axis at $(0,4).$
Its axes are parallel to the coordinate axes.
Find the distance between the foci of the ellipse. read more ..

Guest Jul 3, 2023

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127

2

2^n+1=26 find n

2^n+1=26 find n

Guest Jul 3, 2023

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142

1

4^n=26 find n

Guest Jul 3, 2023

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83

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+6

I need your help right now

Let ABC be an acute-angled triangle and let ha, hb, hc be the lengths of its altitudes, while r and R denote the inradius and the circumradius of ABC, respectively. Prove that
a) AH + BH + CH = 2R(cos A + cos B + cos C); (Hint: In order read more ..

HogRider69 Jul 3, 2023

Jul 2, 2023

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146

1

+131

HELP ASAP

Find the remainder when is divided by 30.

SportzGuy2310 Jul 2, 2023

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99

4

Algebra

Joan's stamp collection consists of three books. Two tenths of her stamps are in the first book, several sevenths are in the second, and there are 303 stamps in the third book. How many stamps are there in Joan's collection?

Guest Jul 2, 2023

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151

1

someone help me with this

The height (in meters) of a shot cannonball follows a trajectory given by $h(t) = -4.9t^2 + 14t - 0.4$ at time t (in seconds). As an improper fraction, for how long is the cannonball above a height of 6 meters?

Guest Jul 2, 2023

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143

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help

Choose an integer randomly from the set $\{1,2,3,\dots,99,100\}$. Square it, then subtract 1. What is the probability that the resulting value is a prime number?

Guest Jul 2, 2023

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