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3 years ago

Which statement about y = x2 + 7x - 30 is true?

Mathematics

1 answer:

Lady_Fox [76]3 years ago

4 0

Answer:

D. The zeros are 3 and -10, because y = (x - 3)(x + 10).

Step-by-step explanation:

$y=x^2+7x-30$

$0=x^2+7x-30$

$0=(x+10)(x-3)$

Therefore, D is correct by the Zero Product Property

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Evaluate this. <br><br> SHOW FULL WORK!!!

faust18 [17]

Hi there!

2³ [ (15 - 7) × (4 ÷ 2) ] = 8 [ 8 × 2 ] = 8 × 16 = 128

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4 years ago

Read 2 more answers

Gordon types 2,964 words in 39 minutes. Find the unit rate.

atroni [7]

Answer:

76 words per minute

Step-by-step explanation:

2964/39=76 words per minute

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3 years ago

2. How many different hands of 3 cards hands be chosen from a deck of 52 cards?

krok68 [10]

Answer:

There are 132,600 ways are there.

<h3>Explained:</h3>

We note that there 52 ways to choose the first card, 51 ways to choose the second card, and 50 ways to choose the third card, for a total of 52*51*50=132,600 ways

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3 years ago

The accompanying data on x= head circumference z score (a comparison score with peers of the same age - a positive score suggest

djverab [1.8K]

Answer:

$r=0.77$ , $\hat{y}=770.50+39.37x$ and volume of cerebral brey matter for a child whose head circumference Z score at age 12 months was 1.9 is $\hat {y}=920.10$

Step-by-step explanation:

We attached a table below,

$(a)$ We attached a table below,

Therefore ,

correlation coefficient $r=\frac{\frac{1}{18}(21766.7)-(\frac{27.25}{18} )(\frac{13890}{18} ) }{\sqrt{\frac{1}{18} (59.8435)-(\frac{27.25}{18} )^2}\sqrt{\frac{1}{18}(10767400)-(\frac{13890}{18} )^2 } }$

$=\frac{41.04}{53.19}$

$=0.77$

$(b)$ We calculate the least squares equation.

$b_1=r(\frac{\sigma_y}{\sigma_x} )\\ =(0.77)(\frac{\sqrt{\frac{1}{18} (10767400)-(\frac{13890}{18} )^2} }{\sqrt{\frac{1}{18}(59.8435)-(\frac{27.25}{18} )^2 } } )\\ =0.77(\frac{52.15}{1.02} )\\ =0.77(51.13)\\ =39.37$