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Sedaia [141]
2 years ago
7

Solve for x.................

Mathematics
1 answer:
cluponka [151]2 years ago
6 0
Since it seems balanced it means the other side also has to have 7 balls so if you subtract 7 - 3 = 4 that means the envelope with the unknown amount of balls has 4 balls in it.
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the diameter of a tree varies directly with its age. A 15-year old tree has a 3.75 in diameter. How old will the tree be when it
dlinn [17]

Answer:

x=15*25/3.75

x=100

tree is 100y old

Step-by-step explanation:

5 0
3 years ago
What Is k 5(3-2k)=2k+39​
Hatshy [7]

Answer:

k = -2.

Step-by-step explanation:

5(3 - 2k) = 2k + 39     Distribute the 5 over the parentheses:

15 - 10k = 2k + 39

15 - 39 = 2k + 10k

12k = -24

k = -2.

8 0
2 years ago
Use the discriminant to describe the roots of each equation. Then select the best description.16x2 + 8x + 1 = 0double rootreal a
SSSSS [86.1K]

Hello!

The discriminant of quadratic functions is: b² - 4ac. Since the equation is in standard form, which is Ax² + Bx + C = 0 , we can substitute those values into our discriminant and simplify.

The value of the discriminant will tell us how many solutions there are to the given quadratic equation.

A positive discriminant will have two real solutions.

A discriminant of zero will have one real solution.

A negative discriminant will no real solutions.

1. Substitute, a = 16, b = 8, c = 1.

8² - 4(16)(1)

64 - 4(16)(1)

64 - 64(1)

64 - 64

0

Since the discriminant is zero, the answer is choice A, double root, because since it is raised to the power of 2, it must has two roots, but in this case, both of the roots the same x-values.

3 0
3 years ago
Will be giving brainliest to the correct one, no links or account will be reported:)
aleksandr82 [10.1K]

Answer:

x = 38

∠P = 26º

Step-by-step explanation:

The sum of the angle in a triangle is 180

x + (x + 78) + (x - 12) = 180

Combine like terms

3x + 66 = 180

Subtract 66 from both sides

3x = 114

Divide both sides by 3

x = 38

-----------------------

∠P = x - 12

∠P = 38 - 12

∠P = 26º

7 0
2 years ago
Read 2 more answers
Mrs. Smith ordered 5 boxes of school materials.
Georgia [21]

ummmmmmmm Maybe 350 I think

3 0
3 years ago
Read 2 more answers
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