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Softa [21]
3 years ago
11

2. Mary's test average after 8 tests is 80. Her score on the

Mathematics
1 answer:
anastassius [24]3 years ago
6 0

Answer:

D

Step-by-step explanation:

since her test average for the first 8 tests is 80, the sum of all the scores for the first 8 tests is 640. Since her 9th test is 71, we do 640+71=711. To find the average of all 9 tests, we do 711/9 = 79

D

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Answer:

(9,-6)

Step-by-step explanation:

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On a coordinate plane, a line goes through (negative 3, 0) and (0, negative 6).
shusha [124]

Answer:

B. (1,-8)

Step-by-step explanation:

Slope of the first one:

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let x=k

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5 0
3 years ago
8) Factor each sum or difference of cubes completely.<br> a. 8x3 + 27
ASHA 777 [7]

Answer:

\large\boxed{(2x+3)(4x^2-6x+9)}

Step-by-step explanation:

8=2^3\\\\8x^3=2^3x^3=(2x)^3\\\\27=3^3\\\\8x^3+27=(2x)^3+3^3\qquad\text{use}\ a^3+b^3=(a+b)(a^2-ab+b^2)\\\\=(2x+3)\bigg((2x)^2-(2x)(3)+3^2\bigg)=(2x+3)(4x^2-6x+9)

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solniwko [45]

Answer:

Step-by-step explanation:

let the first angle be 5x

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HOPE THIS HELPS YOU !!!

6 0
3 years ago
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