Jack spends 1 2/5 as long on his homework as Jill. Last week, Jill spent 6 3/4 hours doing homework. How long did Jack spend doing homework?

Answers

Answer 1

Answer: 6 3/4 hours = (6*60)+45 = 405 minutes
7/5 = 1,4
405 minutes * 1,4 = 567 minutes
= Jack spent 9 3/4 hours

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PLEASE ANSWER ASAP AND EXPLAIN!!!!!!!!!!!At an aquarium, researchers are preparing a mixture of salt water. The desired ratio is 90 grams of salt per liter of water.•
1 ounce = 28.35 grams• 1 gallon = 3.8 liters

What is the ratio in ounces per gallon?
A. 0.8 ounce per gallon
B. 3.2 ounces per gallon
C. 12.1 ounces per gallon
D. 23.7 ounces per gallon

Answers

Answer: use mathpapa

Step-by-step explanation:

What is 12.9 divided by 0.6

Answers

$12.9:0.6=129:6=(120+9):6=120:6+9:6\n\n=20+(6+3):6=20+6:6+3:6=20+1+3:6=21+3:6\n\nAnswer:\n\n12.9:0.6=21+3rest\n\nor\n\n12.9:0.6=21+3:6=21+(3)/(6)=21+(1)/(2)=21(1)/(2)=21.5$

Question 2A please! :)

Answers

Hi there!

In order to use mental math, we'll round up each value to the nearest whole number. Here's what we'd have: 10 + 9 + 11 + 9 + tax. Next, add the values together. We know that 9 and 11 equal 20, so then adding another 9 would give us 29, and adding a 10 would give us 39. To add tax, we can round up to 10%, which would give us 3 dollars and 90 cents, which can be rounded up to 4 dollars. Lastly, add 39 and 4 to give you a mental math answer of $43.

Hope this helps!! :)
If there's anything else that I can help you with, please let me know!

Which decimal is equal to 7/10?

A. 0.71

B. 0.7

C. 0.07

D. 0.071

Answers

The answer is B) 0.70

7/10 = 7 tents
7 tenths = B (0.7)
Read the fraction to decimal

OR

7/10 = 70/100 = 70% = 0.70 = 0.7

OR

Divide 7 by 10

What is the mixed number and improper fraction for 4.8

Answers

mixed number=4 8/10=4 4/5

improper fraction=48/10=24/5

I need help for this.A line has gradient 6 and passes through the points with coordinates (-1,6) and (7,a). Find the value of a

Answers

$General\ formula\ for\ line:\n\ny=ax+b,\ where\ a-gradient\n\ny=6x+b\n\nSubstitute\ point\ (-1,6):\n\n6=6\cdot(-1)+b\n6=-6+b\nb=6+6\nb=12\n\ny=6x+12\n\nSubstitute\ point\ (7,a)\n\na=6\cdot7+12\na=42+12=54$

We can also see it this way:

Noting that point in the form (x, y)
(-1, 6) and (7, a) . x1 = -1, y1 = 6, x2 = 7, y2 = a
Gradient , m = (y2- y1) / (x2 - x1). m =6.
Substituting:

6 = (a - 6) / (7 - -1)
6 = (a -6) / (7+1)
6 = (a -6) /8 Cross Multiplying
48 = a -6.
48 +6 = a.
54 = a.
Therefore a = 54.
I hope this helps.

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