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Naddik [55]
3 years ago
9

5(x+4)>2x-7 please help

Mathematics
1 answer:
Alik [6]3 years ago
3 0

Answer:

x > -9

Step-by-step explanation:

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Johnny is picking marbles out of a bag. The results are recorded below.
Kisachek [45]

Answer:

A

Step-by-step explanation:

The total number of marbles is 24 + 16 + 10 + 22 + 8 = 80

Blue has been picked 16 times

P(Blue)= 16/80 * 100 = 20%

6 0
3 years ago
Points A, B, and D are on both planes.
zalisa [80]

Answer:

What is your question? A plane does need three points so this would make sense.

Step-by-step explanation:

A plane must have three points, otherwise it could be a line (from two points) or a single point (one point).

6 0
3 years ago
Misty wishes to obtain 85 ounces of a 40% acid solution by combining a 72% acid solution with a 25% acid solution. How much of e
Y_Kistochka [10]

13.15 ounces of 72% acid and 71.85 ounces of 25% acid are needed

<u>Step-by-step explanation:</u>

Total mass of acid required= 85 ounces

Let the mass of 72% acid be 'a'

Let the mass of 25% acid be 'b'

a + b = 85

b = 85-a

85(40/100) = a(72/100) + b(25/100)

85(2/5) = a(72/100) +(85- a) (25/100)

34 = (72a/100) + (2125/100) - (25a/100)

34 - (2125/100) = (72a + 25a) /100

(3400-2125)/100 = 97a /100

97a = 1275

a =  13.15 ounces

b = 85 - 13.14

b = 71.85 ounces

13.15 ounces of 72% acid and 71.85 ounces of 25% acid are needed

4 0
3 years ago
Omg cholesteral please help me with this one<br> letter choices
Akimi4 [234]

Population density (people per square mile) is found by dividing population by square miles. The appropriate numbers are found in choices A and B, but only choice B uses the <em>divided by</em> operation.

The appropriate choice is ...

... B) 1.2e6÷1.1e4

3 0
3 years ago
The claim is that the standard deviation of the speeds of drivers in Bradford is 8 mph. An experienced driver feels that this is
Irina-Kira [14]

Answer:

Null hypothesis is rejected. Standard deviation is > 8 miles per hour

Step-by-step explanation:

σ [Population standard deviation] = 8 , s [sample standard deviation] = s

n [no of items] = 8

H0 [Null] : σ = 8 ; H1 [Alternate - Right Tail] : σ > 8

χ2 = (n - 1) . s^2 / σ^2

= 49 x (10.5)^2 / 82 = 5402.25 / 64

χ2 = 84.410

df [degree of freedom] = n -1 = 50 - 1 = 49

P value (χ^2 49 > 84.410) = 0.00125

p = 0.0013

p < α ie 0.05

So, H0 is rejected

Hence we state that standard deviation is > 8 miles per hpur

6 0
3 years ago
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