Answer:
the answer of 8÷30 is 0.266
Answer:
-3 is a solution.
General Formulas and Concepts:
<u>Pre-Algebra</u>
Order of Operations: BPEMDAS
- Brackets
- Parenthesis
- Exponents
- Multiplication
- Division
- Addition
- Subtraction
Equality Properties
- Multiplication Property of Equality
- Division Property of Equality
- Addition Property of Equality
- Subtraction Property of Equality<u>
</u>
Step-by-step explanation:
<u>Step 1: Define</u>
3 - 4r ≥ 15
<u>Step 2: Solve for </u><em><u>r</u></em>
- [Subtraction Property of Equality] Subtract 3 on both sides: -4r ≥ 12
- [Division Property of Equality] Divide -4 on both sides: r ≤ -3
<u>Step 3: Compare</u>
- Substitute in <em>r</em>: -3 ≤ -3
This is true. -3 is less than <em>or equal to</em> -3.
Step-by-step explanation:
sofia mother-- 12+2a
sofia-- 2a
after 8years
sofia mother (2a×3) - 20
sofia 2a+8
solution
(2a×3) - 20) + 2a = (12+2a) + (2a+8)
(6a-20) + 2a = 12+2a+2a+8
6a-20+2a = 4a + 20
8a-20= 4a+20
collect like terms
8a-4a= 20+20
4a=40
divide both side by 4
a= 10
present age
sofia mother= 12+2a
12+2(10)
=12+20
= 32
sofia age= 2a
= 2(10)
= 20
Sofia mother present age is 32
sofia present age is 20
