Explain how to simplify this expression: 4a + 19 - 3a - 7

Solution:

we have been asked to simplify the expression

while simplifying the  expression, then the most important point is  that we must apply PEMDAS rule

But here we do not need this rule because here we just need to take like twems togethere and simplify

Hence the simplified expression is a+12

let x be the money she spent so that she can earn the free t-shirt.

since, she already spent $112.49

⇒

also, as per the statement: jennifer must spend $250 or more in order to qualify for a free t-shirt at the store.

then,

we have an inequality i.,e

subtract 112.49 from both sides we get;

therefore, $137. 51 more money does jennifer need to spend so that she can earn the free t-shirt

answer: bearing in mind that a rectangle has a perimeter of length + length + width + width.

step-by-step explanation:

p = perimeter

l = length

x=width

p = 2l + 2x

p = 2(l+x)     < ==== perimeter of the base of the box.