All categories

3 years ago

PLEASE HURRYYYYYY

Mathematics

2 answers:

BlackZzzverrR [31]3 years ago

8 0

C) r = T + 25.3 because you isolate the r variable

dolphi86 [110]3 years ago

4 0

Answer:
C). R=T-25.3

Explanation:
Do the opposite
Instead of adding you subtract
Therefore it becomes T-25.3

You might be interested in

HELP... and plz show work #wefailing #helpmepass 25+ points to the brainlest answer

Marianna [84]

Answer:

answer 1 b

Step-by-step explanation:

answer 2 d

8 0

2 years ago

If 3 of the Roberts 4 dogs are black, what percent are NOT black

Annette [7]

since 3/4 or 75% ARE black, 1/4 will not be black. 1/4=.25 which is 25%.

3 0

2 years ago

What relation does not have an initial value of 50

Mamont248 [21]

I guess itz B because with the rest, a number can be added to get exactly 50. Example C. y= 50x. x could be 1 which is still 50 and D. y=50-x and x could be 0 which is still 50 whiles A. y=50 remains 50

4 0

3 years ago

On Monday, 408 students went on a trip to the 200 All 7

kap26 [50]

Answer:

Step-by-step explanation:

408-9 =399

399/7 =57

7 0

3 years ago

The ratio of Wei Ling's age to Wei Xuan's age 5 years ago was 2: 5. In 9 years

Archy [21]

Answer:

15 years old

Step-by-step explanation:

Start by defining the variables that we are going to use throughout our working:

Let the current age of Wei Ling and Wei Xuan be L and X years old respectively.

Next, form equations using the given information.

5 years ago

Wei Ling: (L -5) years old

Wei Xuan: (X -5) years old

Given that the ratio of Wei Ling's age to that of Wei Xuan's is 2: 5,

$\frac{ L - 5}{X - 5} = \frac{2}{5}$

Cross multiply:

2(X -5)= 5(L -5)

Expand:

2X -10= 5L -25

2X= 5L -25 +10

2X= 5L -15 -----(1)

9 years time

Wei Ling: (L +9) years old

Wei Xuan: (X +9) years old

Given that the ratio of Wei Ling's age to that of Wei Xuan is 3: 4,

$\frac{L + 9}{X + 9} = \frac{3}{4}$

Cross multiply:

3(X +9)= 4(L +9)

Expand:

3X +27= 4L +36

3X= 4L +36 -27

3X= 4L +9 -----(2)

Let's solve using the elimination method.

(1) ×3:

6X= 15L -45 -----(3)

(2) ×2:

6X= 8L +18 -----(4)

(3) -(4):

6X -6X= 15L -45 -(8L +18)

0= 15L -45 -8L -18

0= 7L -63

7L= 63

L= 63 ÷7

L= 9

Substitute L= 9 into (1):

2X= 5(9) -15

2X= 45 -15

2X= 30

X= 30 ÷2

X= 15

Thus, Wei Xuan is 15 years old now.

6 0

2 years ago