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Vera_Pavlovna [14]
3 years ago
6

What number is 1218 tens and ones

Mathematics
1 answer:
andrezito [222]3 years ago
4 0
121 tens and 8 ones
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-6x -6y = 66 <br>2x + 4y = -32​
RoseWind [281]

Answer:

(23/2, 1/2)

Step-by-step explanation:

Let's solve this system through elimination by addition/subtraction:

Divide all three terms of the first equation by 3.  This results in the equivalent system

-2x - 2y = 33

2x + 4y = -32

Combining like terms results in:

2y = 1, and so y = 1/2.

Let's use the first equation and y = 1/2 to find x:

-6x - 6(1/2) = 66

This becomes -6x - 3 = 66, or -6x = 69, or x = -69/6 , or x = 23/2

The solution is thus (23/2, 1/2)

-

7 0
2 years ago
Which statements about opposites are true?
Naily [24]

Answer:

I think B and C are the only ones true

5 0
3 years ago
Tell the maximum number of zeros that the polynomial function may have. then use​ descartes' rule of signs to determine how many
Marta_Voda [28]
F(x) = -4x^7 +x^3 -x^2 +5

a) It is a degree 7 polynomial, so will have 7 zeros (some may be repeated).

b) has 3 sign changes, so 1 or 3 positive real zeros. If odd powers have their signs reversed, the signs are changed to +--+, so there are 2 sign changes. There will be 0 or 2 negative real zeros.

____
There is actually 1 positive real zero and 0 negative real zeros. This means there are 3 conjugate pairs of complex zeros.

3 0
3 years ago
The scores on an entrance exam to a university are known to have an approximately normal distribution with mean 65% and standard
emmasim [6.3K]

Answer:

The correct answer is - C. 24.1%

Step-by-step explanation:

Given:

mean μ = 65%

standard deviation δ = 7.1 %

solution:

Prob( X>70) = 1 - Prob(x<70)  

= P (x-μ/δ ≥ 70 -65/7.1)

= 1 - Prob( (70-65)/7.1)

= 1 - Prob ( z < 0.7042553)

= 0.24065

the percentage of students scoring 70 or more in the exam

= 24.065*100

= 24.1%

4 0
2 years ago
Ten customers enter a convenience store during their lunch hour on Monday. The age of each customer is identified on the dot plo
Ksenya-84 [330]
F. 30 is the correct answer, for mean you just have to add all the ages together and divide by the number of customers
7 0
3 years ago
Read 2 more answers
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