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Arisa [49]
3 years ago
5

Find the sum of the first 90 terms of the sequence –4, –1, 2, 5, 8, ...

Mathematics
2 answers:
Aleks04 [339]3 years ago
8 0
Hello : 
-1-(-4) =2-(-1)=5-2=8-5=3     ( arhtmitic sequence   r= 3)
Un = U1+(n-1)r
U90 = -4+(90-1)(3)= 263
sum = n/2 (U1 +U90)
sum = 90/2(-4+263) = 11655
Juli2301 [7.4K]3 years ago
6 0

Answer:

11655 is correct

Step-by-step explanation:

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Find the 7th term of the arithmetic sequence 4x + 5, 11x + 9,18x + 13, ...
Svet_ta [14]

Step-by-step explanation:

we see the common difference is

a2-a1 = 11x + 9 - 4x - 5 = 7x + 4

an = an-1 + (7x+4) = a1 + (n-1)×(7x+4)

for a7 we have then

a7 = 4x + 5 + 6×(7x +4) = 4x + 5 + 42x + 24 = 46x + 29

5 0
3 years ago
Evaluate ab for a = 11 and b = 4. <br><br> a.15 <br> b.44 <br> c.114 <br> d.40
skad [1K]

ab = (11)(4) \\ ab = 44

Answer is B. 44

Hope this helps. - M
7 0
3 years ago
Read 2 more answers
PLEASE HELP
Sati [7]

Answer:

The answer is A, ab<cd.

Step-by-step explanation:

If a, b, c, d are positive, and if a b < c d , then Ab>cd is always true

3 0
3 years ago
Andrew and Kate have $30 to spend on dinner, tax, and gratuity at Mo’s Restaurant. Tax is 6%, and they will give a 15% tip on th
ivanzaharov [21]

Answer:

ANSWER: Yes. They have enough to pay their bill: 21 dollars times 1.06 = 22 dollars and 26 cents and 22 dollars and 26 cents times 1.15 = 25 dollars and 60 cents.

Step-by-step explanation:

convert all % to decimals

0.06 x 21 = $1.26 tax

0.15 x 21 = $3.15 tip

1.26 + 3.15 = $4.41 added payment

4.41 + 21 = = $25.41 total bill

(yes i am aware i did the method differently since i learned it another way but the answer should till be correct.)

4 0
3 years ago
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Solve for the unknown variable and verify your answer. 2.8(3d – 2) = –12.32 *<br> Answer?
Rom4ik [11]

Answer:

-.8

Step-by-step explanation:

divide both sides by 2.8

3d-2=-4.4

add two to both sides

3d=-2.4

divide both sides by 3

d=-.8

7 0
3 years ago
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