MATHEMATICS HIGH SCHOOL

There are 480 light bulbs to be packed in boxes of 8. If 20% are cracked, how many boxes are needed to pack the remaining bulbs? a) 48 boxes b) 52 boxes c) 60 boxes d) 56 boxes

Answers

Answer 1

Answer:

Answer: 48 Boxes

Step-by-step explanation:

20% of 480 = 0.20 x 480 = 96 cracked

480 - 96 = 384

384 ÷ 8 = 48 boxes

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I need help with 10. A-C please

Answers

A. first total salary (S) is what is being found so put that on one side of the equal side, then 100 dollars are being made and this is not changed so we don't need a variable, put that on the other side of the equal sign. and since sales (X) is changing, keep the variable, 30% of that is added to the salary, so multiply that by x (first turn it into a decimal, divide it by 100) and add that to the initial 100

S=100+.3X

B. do the same thing above but with a new decimal and initial salary

S=150+.15X

C. since they both need to be equal (S=S) you can replace the S on one equation with the other

100+.3X=150+.15X

Two Amtrak trains traveling on parallel tracks leave Tucson at the same time. In 6 hours the faster train is 382 miles from Tucson and the trains are 112 miles apart. Find how fast each train is traveling.

Answers

Answer: the faster train is travelling at 63.7 mph

The slower train is travelling as 45 mph

Step-by-step explanation:

Distance = speed × time

Speed = distance/time

The two trains leave Tucson at the same time. In 6 hours, the faster train is 382 miles from Tucson. This means that the speed at which the faster train is travelling is

382/6 = 63.7mph

In 6 hours, both trains are 112 miles apart. This means that the distance covered by the slower train in 6 hours is

382 - 112 = 270 miles

Therefore, the speed at which the slower train is travelling is

270/6 = 45 mph

Sara has 15 apples and 12 oranges. How many pieces of fruit does she have?

Answers

27 pieces o' fruit!!!!
15 + 12 = 27

15apples 12oranges
15 + 12 = 27 apples

derivative of this function

Y= -7X³ -8X² +6X +3

Answers

In general, the derivative of a single term Ax^(n) is A n x^(n-1) .

And the derivative of a sum of many terms is the sum of the derivatives
of the individual terms.

Using these two rules, the derivative (with respect to 'x') of the expression
in the question is . . .

Y' = -21x² - 16x + 6

Cedro collects state quarter. He has 42 out of 50 available quarters.What is 42 out of 50 as a percent