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chubhunter [2.5K]
3 years ago
15

Tiffany answered 90% of the questions on her test correctly. There were 50 questions on the test. How many questions did she get

right?
Mathematics
2 answers:
jarptica [38.1K]3 years ago
7 0
Tiffany got 45 questions right
saw5 [17]3 years ago
3 0
45 questions was how many she got right.
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Mr. Fernández packed 31 red apples and 41 green apples into a box for a customer. He packed 8 boxes like this. Mr. Fernández use
ratelena [41]
He packed 576 apples into the boxes.
31 + 41 = 72 and 72 * 8 = 576
4 0
3 years ago
How do I find the period of y = -2 cos 0.5x
nevsk [136]
Use the form (bx-c)+ d to find the amplitude , period shift, phase, and vertical shift.
amplitude:2 
period:12.56637061
phase shift : 0(0to the right ) 
vertical shift:0 
hope it helps!
please give me brainlest if its right .
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4 0
4 years ago
What is the solution of the system? Use elimination. 7x + 5y = 19 −7x − 2y = −16
netineya [11]

Make the coefficient of y the same in both equations:

To do this, multiply equation one by 2, and equation two by 5 (this will make the coefficient 10 in both).

14x + 10y = 38
-35x - 10y = -80


Eliminate the y variable by adding the equations from each other

   (14x + 10y = 38)
+ (-35x - 10y = -80)
=  -21x +  0y  = -42

We now have -21x = -42. The y variable has been eliminated.


Solve for x

-21x = -42

Divide both sides by -21 to get x on its own.

x = 2


Substitute x into the equation to find y.

7*2+5y=19

14+5y=19

Subtract 14 from both sides.

5y=19-14

5y=5

Divide by 5 on both sides to get y on its own.

y=5/5

y=1


The answer is (2,1)


8 0
4 years ago
Explain why you would make one of the addends a tens number when solving an addition problem
Marianna [84]
Because your adding on 10more
5 0
4 years ago
what is the final velocity of a runner who is accelerating at 2 feet per second squared for 3 second with an initial velocity of
oksano4ka [1.4K]
He starts at a speed of 4 fps.

He adds 2 fps of speed during each of 3 seconds, for a gain of 6 fps.

At the end of the 3 sec, his speed is (4 + 6) = 10 fps.

We know nothing about the direction in which he runs, so we're in no position to discuss velocity. The best we can do is to determine his final speed.
8 0
3 years ago
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