Seudónimo Seudónimo

12-12-2016
Mathematics

contestada

Twice the sum of a number and 9 equals 7.
Use the variable y for the unknown number.

Respuesta :

12-12-2016

2(y + 9) = 7 Since it says twice the SUM, you have to do the addition first so the 2 times goes outside the parenthesis.

2y + 18 = 7 Subtract 18 from both sides
2y = -11 Divide both sides by 2
y = -11/2

Answer Link

Otras preguntas

what year was the committee of correspondence

Which method of traversing a tree would result in a sorted list for a binary search tree?

Calculate the heat capacity, in joules and in calories per degree, of the following: (a)28.4 g of wate (b)1.00 oz of lead

what volume of 0.0105-M HBr solution is be required to titrate 125 mL of a 0.0100-M Ca(OH)2 solution? Ca(OH)2 + 2HBr ? CaBr2 + 2H2O

If U=the set of natural numbers and A={4,6,8,10,12..} find A’

An artist is planning on mixing together any number of different colors from her palette. A mixture results as long as the artist combines at least two colors.

What is the ratio of sodium ions to chloride ions in one formula unit of sodium chloride with the chemical formula NaCl?

Which is a correct first step for solving this equation? X+7=2x+5-4x

Complete and balance the following oxidation-reduction reactions, which give the highest possible oxidation state for the oxidizing atoms: (a)Al + F2? (b)Al +

What is an important step toward acquiring scientific literacy?