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nikdorinn [45]
3 years ago
6

How many ways can 3 students be chosen from a class of 20 to represent their class at a banquet?

Mathematics
2 answers:
inysia [295]3 years ago
7 0
60 ways because the easy way to solve this problem is identify the numbers being used and than multiply them by each other.
boyakko [2]3 years ago
3 0
Slot method 20 options 3 slots First slot: 20 options Second slot: 19 options (one used up for 1st slot) Third slot: 18 (one less than last) Multiply them 20 times 19 times 18=6840 Answer is 6840 ways
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Which is a factor of 45x^4−5x^2? Show work.<br><br><br>a. 5x+2 b. 9x−1 c. 6x+5 d. 3x−1
Lelu [443]

Answer:

d. 3x - 1.

Step-by-step explanation:

45x^4−5x^2

The GCF is 5x^2 so we have:

5x^2(9x^2 - 1)

The expression in the parentheses is the difference of 2 squares so:

= 5x^2(3x - 1)(3x + 1)

7 0
2 years ago
Jeez math help please!!!!!
viva [34]
(3y^7)^3      3^3*y^(7*3)              
------------ = ------------------   
    9y^9           9*y^9

(3y^7)^3      3^3*y^(7*3)        27*y^21      (mult. together the exponents 3 and 7)
------------ = ------------------ = --------------
    9y^9           9*y^9                 9*y^9

That 27/9 reduces to 3.     y^(21) / y^9  reduces to y^12.

Thus, we obtain           3*y^12   (answer)

Please do the next one, asking questions if need be, and showing your work.

4 0
3 years ago
The product of a number and -7 is at most -70. what is inequality 18 points
zimovet [89]

Answer:

Inequality :

-7x\le \:-70

Step-by-step explanation:

Let the unknown number be x

at most -70 = ≤ -70

x\times(-7) \leq -70\\\\-7x\leq -70

Solving further  :

-7x\le \:-70\\\\\mathrm{Multiply\:both\:sides\:by\:-1\:\left(reverse\:the\:inequality\right)}\\\\\left(-7x\right)\left(-1\right)\ge \left(-70\right)\left(-1\right)\\\\Simplify\\\\7x\geq 70\\\\\mathrm{Divide\:both\:sides\:by\:}7\\\\\frac{7x}{7}\ge \frac{70}{7}\\\\Simplify\\\\x \geq 10

3 0
2 years ago
Use two unit multipliers to convert 1250 square inches to square feet
abruzzese [7]
Divde it by 12^2 or 144
1250/144=8.605555555555ft^2
5 0
2 years ago
Read 2 more answers
Plz help question below
Olenka [21]
It should be A if I did the math right which I think I did
3 0
3 years ago
Read 2 more answers
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