Answer:
M=0
Step-by-step explanation:
(M)=4M+15(M)=7
We move all terms to the left:
(M)-(4M+15(M))=0
We add all the numbers together, and all the variables
M-(+19M)=0
We get rid of parentheses
M-19M=0
We add all the numbers together, and all the variables
-18M=0
M=0/-18
M=0
42 minutes are spent on practicing flip tricks and 48 minutes are spent on practicing slides.
Step-by-step explanation:
Total practicing time = 90 minutes
Ratio of time spent on flip tricks to slides = 7:8
Let,
x be the total time spent on flip tricks and slides, therefore,
Time spent of flip tricks and slides = 7x+8x = 15x
Total time spent practicing = 15x
Dividing both sides by 15
Time spent of flip tricks = 7x = 7*6 = 42 minutes
Time spent on slides = 8x = 8*6 = 48 minutes
42 minutes are spent on practicing flip tricks and 48 minutes are spent on practicing slides.
Keywords: ratio, division
Learn more about ratios at:
#LearnwithBrainly
Answer:
Step-by-step explanation:
-2x + 2y = -4 (times 3) -6x + 6y = -12
3x + 3y = -18 (times 2) 6x + 6y = -36
.
-6x + 6y = -12
<u>6x + 6y = -36 </u>+
12y = -48
y = -4
.
Substitute the value of y to the one of equations
-2x + 2(-4) = -4
-2x - 8 = -4
-2x = -4 + 8
-2x = 4
x = -2
<u>During the first hour</u> . . .
5% of the 1,000 bacteria die. At the end of the hour, 95% of them are left.
95% of 1,000 = 950
Then 100 are added : 950 + 100 = 1,050
<em>1,050</em> bacteria swimming around in the soup as the second hour begins.
<u>During the second hour</u> . . .
5% of the 1,050 bacteria die. At the end of the hour, 95% of them are left.
95% of 1,050 = 997.5
Then 100 are added : 997.5 + 100 = 1,097.5 . . . . . <em>1,098</em> rounded
===================================
<u>Playing with this some more</u>:
If the same process continues, and the result at the end of each hour
is rounded to the nearest whole number, then the number of bacteria
steadily increases, but only for 88 hours. At the end of the 88th hour,
there are 1991 of the little critters, and after that, the population stays
constant at 1991. That's because the 5% loss during each hour after
that is (5% of 1,991) = 99.55 , which rounds to 100, and those are
replaced by the 100 new ones.
