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2 years ago

Please help me I will give you extra points and the brain thing

Mathematics

1 answer:

vovangra [49]2 years ago

4 0

Answer:

A. n = 5

Step-by-step explanation:

S = n² + n

When S = 30:

n² + n = 30

Subtract 30 from both sides: n² + n - 30 = 0

Factorize: (n - 5)(n + 6) = 0

Therefore n = 5 or -6

As n > 2, then n = 5 only

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Determine the type and number of solutions of −4x2 − 3x + 7 = 0.

Kaylis [27]

Answer:

Step-by-step explanation:

You have to use the discriminant for this. If the quadratic is $-4x^2-3x+7$ , then

a = -4, b = -3, and c = 7. The formula for finding the discriminant is

$D=b^2-4ac$ which comes from the quadratic formula, but without the square root sign. Filling in:

$D=(-3)^2-4(-4)(7)$ which simplifies down to

D = 9 + 112 so

D = 121. This is a perfect square, so the solutions will be 2 real. Just so you know, you will NEVER have a solution like the one offered in the third choice down. If you have one imaginary root, you will ALWAYS have a second by the conjugate rule.

7 0

3 years ago

Ellie is ordering hot dogs for her son's birthday party. Each hot dog cost $1.50. For orders smaller than a dozen hot dogs, ther

Juliette [100K]

Answer:

Step-by-step explanation:

If the person only ordering one hotdog which is 1.50 dollars why should they have to pay 3 dollars

7 0

3 years ago

Read 2 more answers

What is mBCD. Please help. Quickly

Flauer [41]

Answer:

82°

Step-by-step explanation:

m÷ BAD + m÷ BCD = 180°

98° + m÷BCD = 180°

m÷BCD = 180° - 98°=  82°

6 0

2 years ago

Records for the past several years show that 46% of customers at a local game shop use a customer loyalty card. Due to a recent

Ratling [72]

Answer:

1. Null hypotheses: p=0.49

Alternative hypotheses: p>0.49

2. p=0.5704 or 57.04%

Step-by-step explanation:

We have to writer the hypotheses for testing the proportion has increased from 49%. So, the population proportion that is to be tested is 0.49.

As we already know that the null hypotheses always contain equality so,

Null hypotheses: p=0.49

and we have to test whether the proportion has increased from 0.49, so,

Alternative hypotheses: p>0.49

Thus, the hypotheses for testing the proportion has increased from 49% are

Null hypotheses: p=0.49

Alternative hypotheses: p>0.49

We have to find the proportion of sampled customers using loyalty card.

The given sample indicate that 77 out of 135 customers are using loyalty card. So,

p=x/n

where x is the number of favorable outcome and n is total number of outcome.

Here, x=77 and n=135. So,

p=77/135=0.5704 or 57.04%

6 0

3 years ago

I can't figure this one out.

lyudmila [28]

Answer:

it increase and by 16.7

Step-by-step explanation:

6 0

3 years ago