Can someone tell me if this is right thanks

Mathematics

2 answers:

andreyandreev [35.5K]3 years ago

7 0

bearing in mind that an absolute value expression is in effect a piece-wise expression, because it has a ± version.

$\bf 3|x|+7=28\implies 3|x|=21\implies |x|=\cfrac{21}{3}\implies |x|=7\implies \begin{cases} +(x)=7\\ -(x)=7 \end{cases} \\\\[-0.35em] ~\dotfill\\\\ +(x)=7\implies \boxed{x=7}~\hfill -x=7\implies \boxed{x=-7}$

saveliy_v [14]3 years ago

3 0

Yeah because 31x1+7-7=28-7=21

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50pts!!! I need proper help and an easy to understand explanation.

adelina 88 [10]

So since we know that the post is 40 yards away, plug in 40 into the x variable of the equation to solve. If y is greater than 10 when x = 40, then it made it over. If y is less than 10 when x = 40, then it does not make it over. $y=-0.03*40^2+1.6*40$

Firstly, solve the exponent: $y=-0.03*1600+1.6*40$

Next, solve the multiplications: $y=-48+64$

Lastly, solve the addition and your answer will be: $y=16$

Since the football was 16 ft high, as opposed to the goal post's 10 ft, when it was at the goal post, it had successfully gone over the post. And since 16 ft is 6 ft higher than 10 ft, the football was 6 ft higher than the goal post when it went over.

8 0

3 years ago

An ice cream shop sold 48 vanilla milkshakes in a day, which was 40% of the total number of milkshakes sold that day. What was t

german

Answer:

They sold 120 milkshakes that day

Step-by-step explanation:

We can set up a proportion

$\frac{48}{m} =\frac{2}{5}$