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3 years ago

Which expression is equivalent to -8.2-5?

Mathematics

2 answers:

USPshnik [31]3 years ago

7 0

Answer:

-8.2 + (-5)

Step-by-step explanation:

I got you queen

Ira Lisetskai [31]3 years ago

4 0

Answer:

Step-by-step explanation:

First, you'll have to find the answer to -8.2 - 5:

-8.2 - 5

☝️ ☝️☝️

Keep. Change. Change

-8.2 + (-5)

AND, that is also equal to A, so there is your answer!!

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The completion time for an exam is normally distributed with expected value 75 minutes and variance 12 minutes. What is the prob

Debora [2.8K]

Answer:

14.89% or 0.1489

Step-by-step explanation:

First, find the z-score for both 70 and 80 minutes and their corresponding percentile.

$z= \frac{X - \mu }{SD} \\SD=\sqrt{V} =\sqrt{12}\\\mu =75\\z= \frac{X - 75}{\sqrt{12}}\\\\$

For X = 70 minutes:

$z= \frac{70 - 75}{\sqrt{12}}\\z=-1.4434$

This z-score is equivalent to the 7.445 th percentile, so the probability of a student finishing this exam in less than 70 minutes is 7.445%

or X = 80 minutes:

$z= \frac{80 - 75}{\sqrt{12}}\\z=1.4434$

This z-score is equivalent to the 92.555 th percentile, so the probability of a student finishing this exam in more than 80 minutes is 100- 92.555 = 7.445%

Therefore, the probability (P) of a student finishing this exam in less than 70 minutes or more than 80 minutes is:

P = 7.445% + 7.445% = 14.89%

5 0

3 years ago

Find two numbers whose sum is 92, if the first is 4 more than 7 times the second

alexandr1967 [171]

Let x = smaller number
Let y = bigger number

y = 7x + 4

x + y = 92
x + (7x + 4) = 92
8x + 4 = 92
8x = 88
x = 11
y = 7x + 4
y = 81

8 0

3 years ago

Austin has a pocket full of coins consisting of q quarters and d dimes.write an expression to represent the total value of coins

Fantom [35]

19d+14q. Hope you like it.

6 0

4 years ago

Read 2 more answers

Decimal greater than one write the word form and expanded form for each 3.1

True [87]

Three and one tenths. 3+1/10

5 0

4 years ago

Dennis drew the line of best fit on the scatter plot shown below:

matrenka [14]

Answer:

4th option

Step-by-step explanation:

the equation of a line in slope- intercept form is

y = mx + c ( m is the slope and c the y- intercept )

calculate m using the slope formula

m = $\frac{y_{2}-y_{1} }{x_{2}-x_{1} }$

with (x₁, y₁ ) = (2, 12) and (x₂, y₂ ) = (6, 6) ← 2 points on the line

m = $\frac{6-12}{6-2}$ = $\frac{-6}{4}$ = - $\frac{3}{2}$

the line crosses the y- axis at (0, 15 ) ⇒ c = 15

y = - $\frac{3}{2}$ x + 15 ← approximate equation of line of best fit

8 0

2 years ago