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patriot [66]
3 years ago
15

Determine the value of the expression below. 60 - (9÷3)² + 15

Mathematics
1 answer:
Nikitich [7]3 years ago
6 0

Answer:

60-3^2+15

60-9+15

the answer is 66

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Compute the sums below. (Assume that the terms in the first sum are consecutive terms of an arithmetic sequence.)
riadik2000 [5.3K]

Answer:

=18975

Step-by-step explanation:

This is an arithmetic sequence

an = a1 +d(n-1)

a1 =9

d = 12-9 = 3

an = 9 +3 (n-1)

The sum of an arithmetic sequence is given by

Sn = n/2 (a1+an)

So we need to determine what number in the sequence 336 is

an = 9 +3 (n-1)

336 = 9 +3(n-1)

Subtract 9 from each side

336-9 =9+-9 + 3(n-1)

327 = 3(n-1)

Divide each side by 3

327/3 =3/3(n-1)

109 = n-1

Add 1 to each side

109+1= n-1+1

110 = n

336 is the 110  term

The sum from 9 to 336

Sn = n/2 (a1+an)

S 110 = 110/2 (9+336)

          = 55 (345)

          =18975

5 0
3 years ago
1/4 as a percent. Why can't I figure this out I have no idea. Please help me out here. Thank you
dolphi86 [110]

Answer: 25%

Step-by-step explanation:

1/4 as a percentage is 25%

6 0
3 years ago
Read 2 more answers
Ratios, 
masha68 [24]
1. 196 to 7=28.14
2.65 out of 105=1.61
3.112:140=0.8
4. 0.11 to 1.21=11
5. 19:76=0.25
6. 18 to 27=0.66
4 0
3 years ago
HELP Pls !!
Kay [80]

M=(\frac{x_1+x_2}{2},\frac{y_1+y_2}{2})

M=(\frac{8-6}{2},\frac{-2-5}{2})

M=(1,-\frac{7}{2})

Hope this helps.

頑張って!

6 0
4 years ago
PLEASE HELP ME!!!!!!!!!! 57-4t >(their is an egual sign under the less then sign)13
Alexandra [31]
57 - 4t > = 13.....subtract 57 from both sides
-4t > = 13 - 57
-4t > = - 44 ...divide both sides by -4, and change the inequality sign
t < = -44 / -4
t < = 11

u solve inequalities much like u do equations except for one very important rule. In an inequality, if u divide/multiply by a negative number, u have to change the inequality sign.



8 0
3 years ago
Read 2 more answers
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