Mathematics: 8r 2 −5rt+2t 2 8, r, squared, minus, 5, r, t, plus, 2, t, squared from 4r^2+3rt-7t^24r 2 +3rt−7t 2 4, r, squared, plus, 3, r, t, minus, 7, t, squared

8r 2 −5rt+2t 2 8, r, squared, minus, 5, r, t, plus,

onlymyworld27

23.01.2022

-4r^2 +8rt-9t^2

Step-by-step explanation:

We want to subtract 8r^2 -5rt+2t^2 from 4r^2+3rt-7t^2

This is given as:

$4r^2+3rt-7t^2 -(8r^2 -5rt+2t^2)\\$

Open the bracket

$4r^2+3rt-7t^2 -8r^2 +5rt-2t^2\\$

Collect like terms

$4r^2 -8r^2 +5rt+3rt-7t^2-2t^2\\$

Simplify

=-4r^2 +8rt-9t^2

Therefore:

4r^2+3rt-7t^2 -(8r^2 -5rt+2t^2) =-4r^2 +8rt-9t^2

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darlinsanchez08com

24.03.2020

Ama is 8 and her sister is 12.

Step-by-step explanation:

Call Ama's age NOW, a. Her sister's age NOW will be s. Then we have

a = (2/3)s

a - 4 = (1/2)(s - 4)

Substitute the first into the second equation and get

(2/3)s - 4 = (1/2)(s - 4) Multiply by 6 to clear fractions and get

4s - 24 = 3(s - 4)

4s - 24 = 3s - 12

Subtract 3s and add 24 and get

s = 12

a = (2/3)(12) = 8

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