Pls help for math class

Mathematics

2 answers:

anastassius [24]3 years ago

8 0

Answer: 6y - 4

(-y + 5) + (7y - 9)

= (7y - y) + (5 - 9)

= 6y - 4

Step-by-step explanation:

Mashutka [201]3 years ago

6 0

Answer:

6y-4

Step-by-step explanation:

to solve this we are going to combine like terms using pemedas and other mathematical properties.

using the associative property, we know that we can rearrange the groupings of the parenthases

-y+5+7y-9

so now we are going to combine like terms

this leaves us with a final answer of

6y-4

You might be interested in

PLSSS HELP IF YOU TURLY KNOW THISS

sergey [27]

75 , if the bottom number is 4 quarters how many is 3 ?

3 0

3 years ago

Read 2 more answers

PLS HELP I'll mark brainlest!<br> i need the process too!

Phoenix [80]

Answer:

19. 1400 ft^2

20. 1680 + 112pi m^3

For 20, a decimal answer would be 2031.86

Step-by-step explanation:

19. Lateral surface area refers to the area without including any horizontal planes(the tops and the bottoms - hence the name lateral). The lateral surface area of this prism is simply 5 equivalent rectangles. Each rectangle has an area of 280(14*20). Thus, the answer is 280*5 = 1400 $ft^{2}$

20. The volume of a shape such as this(where the horizontal planes are always the same shape) can be calculated by the area of the base times the height. In this case, the area of the base is the semi circle (area of $\frac{4*4*\pi}{2}$ ). The area of the rectangle is 15 * 8 = 120. Adding these together gets you 120 + 8pi. Multiplying this by the height of 14 gets you 1680 + 112 $\pi$ $m^3$