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natali 33 [55]
3 years ago
9

6th grade math help me pleaseee

Mathematics
2 answers:
Lostsunrise [7]3 years ago
6 0

Answer:

12.30 x 6 = 73.8

Step-by-step explanation:

iris [78.8K]3 years ago
6 0

Answer:

61.5

Step-by-step explanation:

12.30 time 5 is 61.5

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15 cm (make sure to not put value with answer (cm))

Step-by-step explanation:

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(3 3/4)÷(−2 1/2)
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At the beginning of the semester students reported that they spend an average of 5 hours per day watching television, decreasing
Katyanochek1 [597]

Answer:

(a) X(t)=X(0)+\Delta X*t=5-0.5*t

(b) X(t)=X(0)+\Delta X*t=1+0.5*t

(c) At 4 weeks, when both will be seeing an average of 3 hours of TV.

Step-by-step explanation:

a) For the students, they start at X(0)=5 h and ΔX=-0.5 h/week.

We can write

X(t)=X(0)+\Delta X*t=5-0.5*t

b) For the professors, they start at X(0)=1 h and ΔX=+0.5 h/week.

We can write

X(t)=X(0)+\Delta X*t=1+0.5*t

c) The seew which they will be watching the same amount of hours will be the 4th week.

X(t)=5-0.5*t=1+0.5*t\\\\5-1=(0.5+0.5)*t\\\\t=4\, weeks

The amount of hours will be

x(4)=1+0.5*4=1+2=3\,hours

7 0
3 years ago
a chemist has two alloys, one of which is 10% gold and 15% lead and the other of which is 30% gold and 40% lead. how many grams
IrinaK [193]
Let the weight of the first alloy will be x grams.
Weight of gold will be 0.1x grams, weight of lead will be 0.15x grams.
Let the weight of the second alloy <span>will be y grams.
</span><span>Weight of gold will be 0.3y grams, weight of lead will be 0.4y grams.
</span>Summarizing:
0.1x+<span>0.3y=60       - gold
</span><span>0.15x+0.4y=88     - lead
</span>
0.1x+<span>0.3y=60     * 10   
</span><span>0.15x+0.4y=88   * 100
</span>
x+3y=600          * 15
15x+40y=8800

15x+45y=9000      
<span>15x+40y=8800
</span>
<span>15x+45y=9000            /15
</span>45y-40y=9000-8800

x+3y=600     
5y=200

x+3y=600     
y=40

y=40
x=600-3*40=480

y=40    
<span>x=480</span>

↑The answers.

6 0
4 years ago
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