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Ratling [72]
3 years ago
15

1.

Mathematics
2 answers:
Serhud [2]3 years ago
6 0

Answer:

D 7x -28 i think it is like this

MAXImum [283]3 years ago
4 0
3(5x-6)-2(4x+5)
15x-18-8x-10
Collect like terms:
15x-8x-18-10
= 7x-28
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Last week, Sarah had exams in Math, Spanish, and English. On the Math exam, the mean was µ = 30 with s = 5, and Sarah had a scor
serious [3.7K]

Answer:

Sara expect the better grade for Math class.

Step-by-step explanation:  

Consider the provided information.

On the Math exam, the mean was µ = 30 with s = 5, and Sarah had a score of X = 45.

Z score for Math: Z=\frac{x-\mu}{s}

Z=\frac{45-30}{5}

Z=\frac{15}{5}

Z=3

On the Spanish exam, the mean was µ = 60 with s = 8 and Sarah had a score of X = 68.

Z score for Spanish: Z=\frac{x-\mu}{s}

Z=\frac{68-60}{8}

Z=\frac{8}{8}

Z=1

On the English exam, the mean was µ = 70 with s = 8 and Sarah had a score of X = 70.

Z score for English: Z=\frac{x-\mu}{s}

Z=\frac{70-70}{8}

Z=0

We can observe that Z score of Math is greater than Spanish and English.

Which means that Sarah did the best in her Math exam.

Hence, Sara expect the better grade for Math class.

8 0
3 years ago
Please help me out and check the question !! ...
pychu [463]
Answer: 200

Because for each minute it goes up 200 more.

3 0
3 years ago
Algebra 2 math. Can someone help me please?
bogdanovich [222]

Answer:

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5 0
3 years ago
Please help with question 15 and 16!!!
kykrilka [37]
15. [4] insufficient information. only given SA
16. There are 3 right triangles, 3 Pythagorean theorem equations 
x²+b²= 16²
12²+a² = x²
a²+4² = b²

combine equations using substitution to get in terms of only x
substitute b² for (a² +x²) in first equation
x²+a²+4²=16²
substitute a² for (x² - 12²)
x²+x²-12²+4² = 16²
solve for x
2x² - 144 + 16 = 256
2x² = 256 + 144 - 16
2x² = 384
x² = 384/2
x² = 192
x = 13.85

rounded to nearest tenth, x = 13.9




6 0
3 years ago
What is -2=-5t+10+2t
frutty [35]

Answer: T is 4

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
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