3 years ago

When a number is decreased by 8.3%, the result is 50. What is the original number to the nearest tenth?

Mathematics

2 answers:

Elena L [17]3 years ago

8 0

Answer:54.15

Step-by-step explanation:

50*(1 +8.3%) =54.15

lesya692 [45]3 years ago

5 0

I'm pretty sure the answer would be 2.

Sorry if it's wrong

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Write the rational number -1, in the form , where a and b are<br> integers.

iogann1982 [59]

Answer:

2nd option

Step-by-step explanation:

- 5 = $\frac{-5}{1}$ ← in the form $\frac{a}{b}$

3 0

3 years ago

What are the solutions of the quadratic equation (x + 3)(x +3) = 49? Ax = -2 and x = -16 Bx = 2 and x = -10 Cx = 4 and x = -10 D

Ivahew [28]

Answer:

4 and -10

Step-by-step explanation:

$\displaystyle (x + 3)(x +3) = 49 \\ x^2+3x+3x+9=49 \\ x^2 +6x+9=49 \\ x^2 + 6x + 9 - 49 = 0 \\x^2+6x-40=0 \\\\ \Delta=b^2-4ac \\ \Delta=6^2-4 \cdot 1 \cdot (-40) \\ \Delta=36+160 \\ \Delta=196 \\ \\ X_{1,2}=\frac{-b \pm \sqrt{\Delta} }{2a} \\ \\ X_1=\frac{-b+\sqrt{\Delta} }{2a} = \frac{-6+14}{2} = \frac{8}{2}=4 \\ \\ X_2=\frac{-b-\sqrt{\Delta} }{2a} = \frac{-6-14}{2}=\frac{-20}{2} = -10$