4 years ago

Which is a correct way of evaluating the expression 9x + 16x for x = 4?

Mathematics

2 answers:

shusha [124]4 years ago

8 0

Substitute the x in the expression for 4.

9(4) + 16(4)

Phoenix [80]4 years ago

7 0

9x + 16x

When x = 4,
9x + 16x = 9(4) + 16(4)
9x + 16x = 36 + 64
9x + 16x = 100

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What is the value of n in the equation –1/2(2n + 4) + 6 = –9 + 4(2n + 1)?

ioda

Answer:

Step-by-step explanation:

$-\dfrac{1}{2}(2n-4)+6=-9+4(2n+1)\qquad\text{use the distributive property}\\\\\left(-\dfrac{1}{2}\right)(2n)+\left(-\dfrac{1}{2}\right)(-4)+6=-9+(4)(2n)+(4)(1)\\\\-n-2+6=-9+8n+4\qquad\text{combine like terms}\\\\-n+(-2+6)=8n+(-9+4)\\\\-n+4=8n-5\qquad\text{subtract 4 from both sides}\\\\-n=8n-9\qquad\text{subtract}\ 8n\ \text{from both sides}\\\\-9n=-9\qquad\text{divide both sides by (-9)}\\\\n=1$