7. The ratio of boys to girls in the grade is 4:5. If there are 20 more girls in the grade, how many boys are there? please I n
1 answer:
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Answer:
a.
b.
Step-by-step explanation:
Solving (a):
Required
Determine her savings.
Solving (a):
Required
Determine the price before tax
First, we need to determine her savings
The price before tax is calculated as follows:
Answer: B
Begin by simplifying the given equation, so it's rearranged into standard form. Move all the terms onto one side, so they equal 0. This would result with -3x-9=0. Quadratic formula is (-b±√(b²-4ac))/(2a). Standard form follow this variable format:
+bx+c. Use the numbers that correspond with each variable to substitute them into the quadratic formula. This would be
(-(-3)±√(-3²-4(4)(-9)/2(4).