All Questions ⁺⁰238231 Questions

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181

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Counting

Syd chooses two different primes, both of which are greater than 10 and multiplies them. The resulting product is less than How many different products could Syd have ended up with?

Guest Feb 22, 2023

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227

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question

what is the square root of 493?

Guest Feb 22, 2023

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211

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+4

Energy Problems with work

A 1210 kg rollercoaster car is moving 8.31 m/s. Before entering the station, it first rolls up a 2.26 m hill. How fast is it moving then?

(Unit = m/s)
read more ..

kchoisser Feb 22, 2023

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206

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help!

Rationalize the denominator of: . The answer can be written as , where and are integers. Find the minimum possible value of .

Guest Feb 22, 2023

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195

2

help please?

If $x+y=\frac{15}{7}$ and $x-y=\frac7{9}$, find the value of $x^2-y^2$, expressed as a common fraction.

Guest Feb 22, 2023

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225

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help

A sequence $\{a_n\}$ satisfies $a_1 = 1$ and \[a_n = \frac{a_{n - 1}}{1 + a_{n - 1}}\]for all n>2.$ Find $a_{10}.$

Guest Feb 22, 2023

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187

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Geometry

In triangle PQR, let M be the midpoint of QR, let N be the midpoint of PR, and let O be the intersection of QN and RM, as shown. If QN perp PR, QN = 12, and PR = 14, then find the area of triangle PQR.

Guest Feb 22, 2023

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186

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counting

We call a number cozy if every digit in the number is either even or next to an even digit. For example, a number is cozy if every digit in the number is either a 2 or next to a 2. For example, the number 222, 72, 45, and 810 and read more ..

Guest Feb 22, 2023

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192

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Geometry

In tetrahedron ABCO, angle AOB = angle AOC = angle BOC = 90^\circ. A cube is inscribed in the tetrahedron so that one of its vertices is at O, and the opposite vertex lies on face ABC. Let OA = 1, OB = 1, OC = 1. Show that the read more ..

Guest Feb 22, 2023

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217

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Counting

Plz help

A standard six-sided die is rolled 7 times. You are told that among the rolls, there was one 1, two 2's, and three 4's. How many possible sequences of rolls could there have been? (For example, 5, 1, 2, read more ..

Guest Feb 22, 2023

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189

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(2x 2 -x) 5 =

Guest Feb 22, 2023

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184

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Math

y=2x-3 on graph

Guest Feb 22, 2023

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196

1

tan 38

Guest Feb 22, 2023

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182

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Counting

Can anyone help plz?

A debate team consists of 5 freshmen and 4 sophomores. (Everyone is distinguishable.) In how many ways can they stand in line, so at least two of the sophomores are standing next to each other, and read more ..

Guest Feb 22, 2023

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181

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Probability

In Ms. Q's deck of cards, every card is one of four colors (red, green, blue, and yellow), and is labeled with one of seven numbers (1, 2, 3, 4, 5, 6, and 7). Among all the cards of each color, there is exactly one card labeled with each number. The read more ..

Guest Feb 22, 2023

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205

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PHYSICS

A load of unknown mass is place in the rear of an 18-wheeler truck. The trucks rear shocks are instantly compressed 10.0cm. Consider the shocks acting as springs with a spring constant, k = 50,000N/m. What is the mass of the load the 18-wheeler just picked read more ..

Guest Feb 22, 2023

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180

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(6–х)^2–x(x+1,4)=36

(6–х)^2–x(x+1,4)=36

Guest Feb 22, 2023

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196

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Expected value

I need help with these

Suppose we have a bag with 10 slips of paper in it. Eight slips have a 3 on them and the other two have a 5 on them.
(a) What is the expected value of the number shown when we draw a single slip of paper?
(b) read more ..

Guest Feb 22, 2023

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