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4 years ago

I don't know how to do it

Mathematics

2 answers:

____ [38]4 years ago

8 0

I would say C because it makes more sense than all the others.

USPshnik [31]4 years ago

3 0

Do elimination make sure that the answer you eliminate doesn't make sence A and B doesn't make since so it's C or D. so D doesn't make sense do its C.

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7/7q+21= x /5q^2-45 then x=?

anzhelika [568]

Answer:

x = 5q - 15

Step-by-step explanation:

$\frac{7}{7q+21}=\frac{x}{5q^{2}-45}\\\\\frac{7}{7(q+3)}=\frac{x}{5 (q^{2} -9)}\\\\frac{1}{q+3}=\frac{x}{5*(q^{2}-3^{2})}\\\\\frac{1}{q+3}=\frac{x}{5(q+3)(q-3)}\\\\\frac{1}{q+3}*5*(q+3)(q-3)=x\\\\5(q-3)=x\\\\x= 5q-15$

3 0

3 years ago

The area of a square is 16 cm2. The square is the base of a cube.

choli [55]

the answer is 96 cm ^ 2

16 × 6 =96

3 0

3 years ago

What’s the answer ?

Misha Larkins [42]

Answer:

3 one ofx+2 And 4th one x4

6 0

3 years ago

If x^2+y^2=1, what is the largest possible value of |x|+|y|?

Marianna [84]

If x² + y² = 1, then y = ±√(1 - x²).

Let f(x) = |x| + |±√(1 - x²)| = |x| + √(1 - x²).

If x < 0, we have |x| = -x ; otherwise, if x ≥ 0, then |x| = x.

• Case 1: suppose x < 0. Then

f(x) = -x + √(1 - x²)

f'(x) = -1 - x/√(1 - x²) = 0 → x = -1/√2 → y = ±1/√2

• Case 2: suppose x ≥ 0. Then

f(x) = x + √(1 - x²)

f'(x) = 1 - x/√(1 - x²) = 0 → x = 1/√2 → y = ±1/√2

In either case, |x| = |y| = 1/√2, so the maximum value of their sum is 2/√2 = √2.

6 0

3 years ago

If using the method of completing the square to solve the quadratic equation x2 - 6x – 7 = 0, which number would have to be adde

Vanyuwa [196]

Answer:

(-3)^2

Step-by-step explanation:

You add 7 on both sides, giving you x^2 - 6x = 7

Then, take half of b, and square it. Giving you x^2 - 6x +(-3)^2 = 7

The answer will be (-3)^2 for this question, but this is not the full solution.

Hope this helped. Good luck on the rest!

3 0

3 years ago