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SOVA2 [1]
3 years ago
8

there are three exams in a marking period.a student received grades of 75 and 81 on the first two exams.what grade must the stud

ent earn on the last exam to get an average of no less than 80for the marking period
Mathematics
2 answers:
7nadin3 [17]3 years ago
6 0

100 becue x times y is x

Paladinen [302]3 years ago
3 0
Average means add all scores and divide by number of scores earned

last score is x
so the sum is 75+81+x
3 scores so (75+81+x)/3=average
must be no less than (greater than or equal to 80)
(75+81+x)/3≥80
solve

times both sides by 3 to clear fraction
75+81+x≥240
156+x≥240
minus 156 from both sides
x≥84

the studen must earn at least 84 on last exam
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Find the value of x then classify the triangle by its angles
Neporo4naja [7]

Answer:

Step-by-step explanation:

3x + x + 60 = 180.

first, we add the x's together.

4x + 60 = 180

then we see if they all have a common multiple. in this case, they do. they are all divisible by 4, so we can use that.

x + 15 = 45

then, just subtract 15 from both sides, that way we get the variable by itself.

x = 30

also, it is a right triangle. the top angle (3x) multiplied by 3 is 90. any triangle that has a 90 degree angle is automatically a right triangle.

6 0
2 years ago
Read 2 more answers
Consider a geometric sequence with a first term of 4 and a fourth term of -2.916.
Orlov [11]

Answer:

a) Find the common ratio of this sequence.

Answer: -0.82

b) Find the sum to infinity of this sequence.

Answer: 2.2

Step-by-step explanation:

nth term in geometric series is given by 4\ th \ term = ar^n-1\\-2.196 = 4r^{4-1} \\-2.196/4 = r^{3} \\r = \sqrt[3]{0.549} \\r = 0.82

where

a is the first term

r is the common ratio and

n is the nth term

_________________________________

given

a = 4

4th term = -2.196

let

common ratio of this sequence. be r

4\ th \ term = ar^n-1\\-2.196 = 4r^{4-1} \\-2.196/4 = r^{3} \\r = \sqrt[3]{-0.549} \\r = -0.82

a) Find the common ratio of this sequence.

answer: -0.82

sum of infinity of geometric sequence is given by = a/(1-r)

thus,

sum to infinity of this sequence = 4/(1-(-0.82) = 4/1.82 = 2.2

4 0
2 years ago
41. Which system is represented by the graph?
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Answer:

the answer is the first choice please mark me brainliest

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2 years ago
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Consider the offered option:
if suppose, that unknown side is '?', then
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6x-6+2*'?'=10x+6;
2*'?'=4x+12;
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3 years ago
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Answer:

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Step-by-step explanation:

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