Consider these signed numbers and determine whether each product is positive or negative.

Mathematics

1 answer:

djverab [1.8K]2 years ago

6 0

Answer:

1. negative. why: a negative multiplied by a positive will always be negative.

2. positive. why: a positive multiplied by a positive will always be positive.

3. positive. why: a negative multiplied by a negative will always be positive.

Step-by-step explanation:

hope this helps

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Elias was given a lock for his school locker. The lock contains numbers between

daser333 [38]

Answer:

34,220

Step-by-step explanation:

Because order doesn't matter, but the numbers can't be repeated, we need to find the number of combinations where 3 individual numbers can be chosen out of 60 possible numbers using the binomial coefficient:

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Thus, Elias can make 34,220 unique 3-number codes given 60 different numbers.

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2 years ago

A local hamburger shop sold a combined total of 813 hamburgers and cheeseburgers on Saturday. There were 63 more cheeseburger so

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9514 1404 393

Answer:

375 hamburgers

Step-by-step explanation:

Let h represent the number of hamburgers. Then h+63 is the number of cheeseburgers, and the combined total is ...

h +(h +63) = 813

2h = 813 -63 = 750

h = 750/2 = 375

375 hamburgers were sold on Saturday.

_____

<em>Additional comment</em>

In a "sum and difference" problem like this, the smaller number is half the difference between the sum and the difference. h = (813 -63)/2 = 375. This generic solution applies to all "sum and difference" problems.

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2 years ago

Let F: R → R be defined by f(x) = x”. Show that f'is one-to-one and onto.

Brrunno [24]

Answer:

both

Step-by-step explanation: