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Stels [109]
3 years ago
8

A student’s standardised mark on a class test was z = –1.7. The mean mark for the class is 55 and the standard

Mathematics
1 answer:
Karolina [17]3 years ago
7 0
The answer is 58, standard deviation is basically telling you that the space between each point in your statistics is on average that amount so that can tell us to take the mean mark of 55 and add 2.85 = 57.85
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How to condense logs using properties of logs
Mkey [24]

The logs rules work "backwards", so you can condense ("compress"?) strings of log expressions into one log with a complicated argument. When they tell you to "simplify" a log expression, this usually means they will have given you lots of log terms, each containing a simple argument, and they want you to combine everything into one log with a complicated argument. "Simplifying" in this context usually means the opposite of "expanding".

There is no standard definition, in this context, for "simplifying". You have to use your own good sense. If they give you a big complicated thing and ask you to "simplify", then they almost certainly mean "expand". If they give you a string of log terms and ask you to "simplify", then they almost certainly mean "condense".

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8 0
3 years ago
3(x-4)=2x-7+x<br> which one<br> A. Infinitesolutions<br> B.x=0<br> C.x=3<br> D.x=-2<br> E.x=-3
BARSIC [14]

Answer:

no solutions

Step-by-step explanation:

I attached the pic of solution

4 0
3 years ago
Hi! Can you please help me and explain?
vazorg [7]

Divide it into 1 rectangle and 3 triangles.

Rectangle : 3 x 8 = 24

Triangle 1: 1/2 x 8 x 2 = 8

Triangle 2: 1/2 x 4x3 = 6

Triangle 3: 1/2 x 4x3= 6

Total area = 24 + 8 + 6 + 6 = 44 square units.

7 0
3 years ago
Four tenths plus four ninths.
stich3 [128]

Answer:

c

Step-by-step explanation:

6 0
3 years ago
What is the length of the unknown side​
KatRina [158]

Answer: ↓↓↓

Step-by-step explanation:

1. a = ?   b = 16  c = 18

a² + b² = c²

a² + (16)² = (18)²

a² +  256 = 324

     - 256   -256

a² = 68

√a² = √68

a ≈ 8.25

2. a = 4     b = 8     c = ?

a² + b² = c²

(4)² + (8)² = c²

16 + 64 = c²

80 = c²

√c² = √80

c ≈ 8.94

7 0
2 years ago
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