Q and A for the topic: General

A pilot flew 390 nautical miles in 45 minutes. Find his average speed in knots (nautical miles per hour)

Write and solve an equation: How long does it take Kathryn to get to her grandmother’s house that is 180 mi away if she averages 45mi/hr on the trip

Write and solve an equation: Find a number such that the difference of 97 and eighteen times the number is five times one more than the number

Find two consecutive integers such that four times the larger is 94 more than three times the smaller

If 30% of the students in a class made a B and there were 12 Bs how many students were in the class?

Evaluate \int_1^4 (5 - 2x + 3x^2) dx :

Find the area between y = 9 - x^2 and y = x + 1 from x = -1 to x = 2

Integration by parts for \int \ln x dx :

show how to do 349-231 in a base 12 system

show how to do 14+231 in a base 12 system

Task 4.(1.5 points)There are several students in the class and some pairs are friends (the friendship relationship is symmetrical). Every student has at least one friend. The whole class came to MatFyz, where each student chooses exactly one of the lectures: either mathematics or computer science. Can you prove that (in each such class) the students can divide themselves into two lectures so that each studentZhad at least one friend who attended a different lecture than the student himself Z.

There are 120 seats in the cinema. Eighth grades come with the same number of students. If three grades come, there will be 54 free seats left. How many seats will be left if four grades come? Can you solve the problem in the form of a proportion or ratio?

There are 120 seats in the cinema. Eighth grades come with the same number of students. If three grades come, there will be 54 free seats left. How many seats will be left if four grades come?

Determine the probability that when throwing a die, it will land: a) number 5 b) a number less than 7 c) number 1 or 4

Ivan learned 15 out of 20 questions. What is the probability that the student got a question he did not learn?

561-( t+154)=137

431+(B-29)=678

Vicente counted 2,367 seashells at the beach. Then he realized he made a mistake and subtracted 400 seashells. How many seashells did he actually count?

Find the critical value Za/2 needed to construct a confidence interval with the given level Level 99.7%

i need 3 addition or subtraction problems with 2 or 3 digit number that equal 5