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Rom4ik [11]
3 years ago
12

(-15) – 8 What is the answer and work

Mathematics
2 answers:
vladimir2022 [97]3 years ago
5 0
Remove the unnecessary parentheses and calculate the difference and your answer is -23
umka2103 [35]3 years ago
5 0
-15-8
It would be -23
you are basically adding 2 negatives together to get a negative still. In other words ,
(-15)+(-8)=-23
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Three numbers a;b; 9; ... are in geometric sequence. If 1 is subtracted from the first term then
kenny6666 [7]

if a b 9 are in GP

b÷a = 9 ÷ b

b^2 = 9a

if a - 1 b 9 are in AP

2b = a+8

b = a+8÷2

substitute

b is equal to a + 8 by 2 in b square equal to 9 a

(a+8÷2)^2 = 9a

a^2+16a+64 = 36a

a^2 -20a +64 =0

(a-16) (a-4) =0

a= 16 or a=4

when a=16 b= 12

when a=4 b= 6

Value of a and b are given above

6 0
3 years ago
The promising alternative energy sources currently under development are fuel cell technology and large-scale solar energy power
Mumz [18]

Answer:

Step-by-step explanation:

a) Denote the event of commercially availability of f_uel cell technology as F_, commercial availability of solar power technology as S

Write the probability of energy supplied by these energy sources in the next 10 years  

P(energy supplied) = P(S ∪ F) -----(1)

Rewrite eqn (1)

P(energy supplied) = P(S) + P(F) - P(F) P(S) ----(2)

substitute 0.85 for P(S) and 0,7 for P(F) in eqn (2) to find the probability of energy supplied by these energy sources

P(energy supplied) = 0.85 + 0.7 - (0.7 * 0.85)

= 0.85 + 0.7 - (0.595)

= 1.55 - 0.595

= 0.955

Therefore, the probability that there will be energy supplied by these two alternative sources in the next 10 years is 0.955

B) write the probability of only one source of energy available

P(only one source of energy available) = P(\bar F S) ∪ P( \bar S F) ---(3)

Rewrite the equation (3)

P(only one source of energy available) =

=P(\bar F S)+P(\bar S F)\\\\=\{[1-P(F)]P(S)+[1-P(S)]P(F)\}---(4)

=\{[1-0.7]0.85+[1-0.85]0.7\}\\\\=0.255+0.105\\\\=0.36

Therefore,The probability that only one of the two alternative energy sources will be commercially viable in the next 10 years is 0.36

4 0
3 years ago
Please help me solve this problem
olga2289 [7]
1,025. Multiply 55 by 15, then add the $200 fee. I hope this helps :)
7 0
3 years ago
Answer 2. will give brainliest
postnew [5]

Answer:

I think c and d

Step-by-step explanation:

srry if im wrong

3 0
3 years ago
Please help and show how :) i will mark you brainliest please help​
levacccp [35]

It is the fourth one because n could be any number on that red line because it’s is greater than -3

4 0
3 years ago
Read 2 more answers
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