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Vlad1618 [11]
3 years ago
15

I need help for tha pre-test?​

Mathematics
1 answer:
cestrela7 [59]3 years ago
3 0

Answer:

1.) B

2.) C

3.) D

4.) B

5.) A

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Find two consecutive positive even integers such that the square of the first decreased by 64 equals 3 times the second.
IRINA_888 [86]

Answer:

10 and 12

Step-by-step explanation:

let the consecutive even integers be n and n + 2 , then

n² - 64 = 3(n + 2) ← distribute parenthesis

n² - 64 = 3n + 6 ( subtract 3n + 6 from both sides )

n² - 3n - 70 = 0 ← in standard form

(n - 10)(n + 7) = 0 ← in factored form

Equate each factor to zero and solve for n

n - 10 = 0 ⇒ n = 10

n + 7 = 0 ⇒ n = - 7

Since n must be a positive even integer then n = 10 and n + 2 = 10 + 2 = 12

The 2 numbers are 10 and 12

8 0
3 years ago
351 students in 27 classes _____ students in each class
77julia77 [94]

Answer:

13

Step-by-step explanation:

351 divided by 27 = 13

7 0
3 years ago
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10y-12=4<br> Help??? Confused??? Trying to make this twenty letters long lol
ruslelena [56]
If you need to solve for y
10y-12=4
10y=12+4
10y=16
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4 0
4 years ago
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I know it is a long question but please I will mark brainlist to the person who answers please help
Diano4ka-milaya [45]

Answer:

Carla lives 16 miles from the Library.

The mistake is drawng the diagram incorrectly and using the miles given in the wrong places. The <u>student's</u> diagram has Yuri in a place that's Southwest of the Library in the diagram given

Step-by-step explanation:

If Yuri lives 24 miles SOUTH of the library, the "b" side of the triangle should be 24, with the Library at the top and Yuri at the bottom left, which is the west end of the base. The base "a" of the triangle should extend 10 to the right (East in compas directions) forming the right angle. Carla lives at the sharp southeast corner of the triangle, and the Hypotenuse "c"  from her house to the Library is the distance we have to figure.

c² =a² + b²

c² = 10² + 24²

c² = 100 + 576

c² = 676

√c² = √676

c = 26       Carla lives 26 miles from the Library.

3 0
4 years ago
PLEASE HELP!!!! 20 pts!If you could explain why that would be amazing!
Leona [35]
Float 

because the water weighs more so it will hold it.
8 0
3 years ago
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