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lesantik [10]
2 years ago
15

HELP PLS

Mathematics
1 answer:
masha68 [24]2 years ago
7 0
I think it would be 0°
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Hey need this ASAP I’ve work through almost just need this one
Jobisdone [24]

Answer:

He must score an 86 or more on his third test.

Step-by-step explanation:

An average is calculated by the sum of the numbers divided by the total number (#) of numbers (if that makes sense). Knowing this, we can write an algebraic equation in order to find the answer. Let x equal the unknown number.

John's previous test scores and this test score now must be at least an average of 90 or more. Therefore, the equation would be \frac{86+98+x}{3} \geq  90. Isolate x to find the answer:

\frac{86+98+x}{3}\geq  90\\ \frac{184+x}{3} \geq  90\\184 + x \geq  270\\x \geq  86

Therefore, he needs to get at least a 86 or higher.

3 0
3 years ago
2. A line passes through the points E(-1, 4) and F(3,-2). Which of the following is the slope of a line that is
AVprozaik [17]

Answer:

  (1)  2/3

Step-by-step explanation:

The slope of EF can be found using the slope formula:

  m = (y2 -y1)/(x2 -x1)

  m = (-2 -4)/(3 -(-1)) = -6/4 = -3/2

The slope of the perpendicular line is the opposite reciprocal of this.

  m' = -1/(-3/2) = 2/3

The slope of a line perpendicular to EF is 2/3.

7 0
3 years ago
A survey of 275 adults found that during the last year, 65 traveled by plane but not by train, 80 traveled by train but not by p
atroni [7]

Answer:

35 adults did not travel by any of these modes of transportation

Step-by-step explanation:

8 0
3 years ago
Production Rate Suppose the number of items a new worker on an assembly line produces daily after t days on the job is given by
dexar [7]

Answer:

(a) 81 items

(b) 104 items

(c) 155 items

Step-by-step explanation:

Given:

The expression for the number of items produced by a new employee daily after 't' days on the job is given as:

l(t)=45\ln(t+1)

(a) Number of days (t) = 5

Average number of items produced can be obtained by plugging in 5 for 't' in the above expression. This gives,

l(t=5)=45\ln(5+1)\\\\l(t=5)=45\ln 6\\\\l(t=5)=80.6\approx 81

Therefore, nearly 81 items are produced after 5 days.

(b) Number of days (t) = 9

Average number of items produced can be obtained by plugging in 9 for 't' in the above expression. This gives,

l(t=9)=45\ln(9+1)\\\\l(t=9)=45\ln 10\\\\l(t=9)= 103.6\approx 104

Therefore, nearly 104 items are produced after 9 days.

(c) Number of days (t) = 30

Average number of items produced can be obtained by plugging in 30 for 't' in the above expression. This gives,

l(t=30)=45\ln(30+1)\\\\l(t=30)=45\ln 31\\\\l(t=31)=154.5\approx 155

Therefore, nearly 155 items are produced after 30 days.

7 0
3 years ago
Algebraic expression for three times the sum of a and b
Paha777 [63]
= 3(a+b)

put a + b in brackets because your multiplying a and b three times
7 0
3 years ago
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