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Natalija [7]
3 years ago
13

BRAINLIESTTT ASAP! PLEASE HELP ME :)

Mathematics
2 answers:
dem82 [27]3 years ago
5 0

Answer:

observational study.

Step-by-step explanation:

balu736 [363]3 years ago
4 0

Answer:

observational study

Step-by-step explanation:

This situation calls for an observational study.  Unfortunately, cardiovascular health is difficult to measure unless one defines some "health scale" so that health could be roughly quantitized.

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4x/5 - 3x/7 = 4x/7 + 5x/7 can anyone please help with explanation...​
kirill115 [55]

Answer: x=0

Step-by-step explanation:

Multiply both sides of the equation by 35, the least common multiple of 5,7.

7×4x−5×3x=5×4x+5×5x

Multiply 7 and 4 to get 28.

28x−5×3x=5×4x+5×5x

Multiply −5 and 3 to get −15.

28x−15x=5×4x+5×5x

Combine 28x and −15x to get 13x.

13x=20x+25x

Combine 20x and 25x to get 45x.

13x=45x

Subtract 45x from both sides

13x−45x=0

Combine 13x and −45x to get −32x

−32x=0

Product of two numbers is equal to 0 if at least one of them is 0. Since −32 is not equal to 0, x must be equal to 0.

X=0

7 0
2 years ago
Colin and Brian were playing darts. Colin scored 91. Brian scored 9 more than Colin. What was their combined score?
Sloan [31]
Answer:
The combined score was 191
Explanation:
91 (Colin’s score) + 9 (how many more Brian had than Colin) = 100 (Brian’s score)
91 (Colin’s score) + 100 (Brian’s score) = 191 (combined score)
6 0
2 years ago
HELP PLS I HABE BEEN STARING AT THUS QUESTION FOR SO LONG​
kari74 [83]

Answer:

56%

Step-by-step explanation:

Reducing the picture by 80% and then by 70% gives a reduction of 56%

70% of 80 = 0.7 × 80 = 56%

7 0
3 years ago
Solve it<br><img src="https://tex.z-dn.net/?f=%20%5Csf%20%5C%3A%205%28x%20-%209%29%20%2B%203%28x%20%20%2B%204%29%20%3D%202%28x%2
JulsSmile [24]

Answer:

5x - 45 + 3x + 12 = 2x - 12 \\ 8x  -  33 = 2x - 12 \\ 6x = 21 \\ x = 3.5

6 0
2 years ago
Read 2 more answers
Multiply out the brackets:<br>(m + 2) (m - 2)​
kramer

Answer:

(m+2)(m-2)=m^2-4

Step-by-step explanation:

(m+2)(m-2)=m(m-2)+2(m-2)

=m^2-2m+2m-4

=m^2-4

6 0
3 years ago
Read 2 more answers
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