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djyliett [7]
3 years ago
14

Help on these plzzzzz it is really hard

Mathematics
1 answer:
velikii [3]3 years ago
7 0
11.

Lateral area of a cube is 4*[(2.5)^2] = 4*6.25 = 25 cm^2;                    B

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(3,4); y>x+2 tell whether each pair is a solution of the given inequality
ch4aika [34]

(3,\ 4)\to x=3,\ y=4\\\\y > x+2

Substitute the values of x and y to the inequality:

4 > 3+2\\\\4>5\ \ FALSE

<h3>Answer: (3, 4) is not a solution if given inequality.</h3>
4 0
3 years ago
How many zeros are in -5x(x-3)(x^2-16)
soldier1979 [14.2K]
Count the number of times x is used as a factor of this polynomial.  I count 4.  Thus, this expression will have 4 zeros.
3 0
3 years ago
Read 2 more answers
58 POINTS PLEASE HELP ASAP
Shalnov [3]

Answer:

4)

Step-by-step explanation:

5 0
3 years ago
What is the mass of 65 cm3 of water? The density of water is 1.00 g/cm3. (THE TEACHER JUST ASKED ME THIS ANSWER QUICK PLS LOL)
vitfil [10]
If the density is 1 per cm^3 and there is 65 cm^3 then the mass is 65g
4 0
3 years ago
2x+9y=27<br> x-3y=-24<br> It’s substitution
harkovskaia [24]

Answer:

x = -9, y = 5

Step-by-step explanation:

Since we need to solve this system of linear equations by substitution, let's transform the second equation into the form, x = ay + b. We start off with x - 3y = -24, subtract 3y from both sides, and we get x = 3y - 24. Then, substitute the expression 3y - 24 for y in 2x + 9y = 27.

2(3y - 24) + 9y = 27    Substitute 3y - 24 for x.  

6y - 48 + 9y = 27        Distribute 2.

15y = 75                      Add & subtract to combine the like terms.

y = 5                            Divide by 15.

Now that we have the value of y, we can find x by substituting 5 for y in any of the equations. Let's use 2x + 9y = 27 for example.

2x + 9(5) = 27             Substitute 5 for y.

2x + 45 = 27               Multiply.

2x = -18                       Subtract.

x = -9                          Divide by 2.

7 0
2 years ago
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